Target practice: how Britain mistook a contract for a delivery strategy

For thirty years British infrastructure has told itself that target cost contracts deliver better outcomes than the lump-sum contracting still standard across much of Europe. The comparative evidence does not support that confidence. Britain is now the most expensive place in Europe to build - and the collaborative model adopted in the name of efficiency demonstrably failed to prevent it. The contract form did not cause that gap, and lump-sum would not have closed it; but target cost was sold as the cure, and the evidence that it is one has never been assembled.

There is a settled story in British construction, and most of us have told it. The old way of building - lump-sum, fixed-price, contractor-takes-the-risk - was adversarial, dishonest and wasteful, and it lingers across the Channel as a sign of a less enlightened culture. The new way - open-book target cost, pain and gain shared, client and contractor on the same side of the table - is collaborative, transparent and efficient. The first belongs to a discredited past. The second is the modern British achievement.

It is a comfortable story. Measured against Europe, it is at best unproven and at worst self-flattering. The sharper contention is not that target cost is a bad instrument - it is that Britain over-claimed for it, and reached for it as a substitute for the disciplines that actually determine whether projects succeed, disciplines that the cheaper European builders never gave up. The charge in this piece is therefore against the orthodoxy, not the tool: against the belief that choosing a collaborative contract is itself a delivery strategy.

Two things follow from that, and they frame everything below. The argument is diagnostic, not a call to abandon NEC or revert to lowest-price lump-sum - the European record, as we will see, forbids that conclusion. And a word on standpoint, since it bears on the prescription: I advise clients on the front-end definition and delivery capability this piece argues are decisive, so the recommendation is not disinterested and should be weighed with that in view. The evidence it rests on, however, stands on its own terms.

Where the orthodoxy came from, and what it promised

The foundations are familiar. Sir Michael Latham's 1994 report Constructing the Team diagnosed an industry crippled by adversarialism and recommended the New Engineering Contract (NEC) as a less confrontational standard form, setting the totemic target of a 30% real reduction in construction costs by 2000.¹ Sir John Egan's Rethinking Construction(1998) reinforced the direction with the language of integrated teams and partnering.² From this came the moral architecture of modern UK procurement: collaboration is virtuous, risk-sharing is mature, and the NEC target cost options (Option C and D) are the natural vehicle for both. The NEC became the default for UK public infrastructure.

The foundational promise was never delivered. Even Latham's admirers accept the 30% cost-reduction pledge was missed.³ Adoption was shallower than the rhetoric implied - a RICS survey as late as 2010 put the NEC at around 7% of contracts - and when recession came, many self-professed collaborators reverted briskly to lowest-price tendering, which suggests the conversion was rhetorical.³ None of this disproves the model. But it should make us cautious about treating three decades of advocacy as three decades of evidence.

The one clean comparison: Britain is the most expensive builder in Europe

There is one metric on which UK and continental delivery can be compared with some rigour: the capital cost of building a kilometre of railway. The Transit Costs Project, which has assembled a global database for exactly this purpose, finds that HS2 is the single most expensive project in its entire database, at roughly $232m per kilometre - and that its cost is not explained away by its share of tunnelling or elevated structure.⁴ Germany's Wendlingen-Ulm high-speed line came in at about $71m/km, under a third of HS2; the Lyon-Turin line at about $130m/km.⁴ Spain, the European exemplar of cheap delivery, has historically built high-speed rail for a fraction again, in the low tens of millions of euros per kilometre, well below Germany and Italy.⁵

This is the fact the British orthodoxy has to explain and cannot. The country that reorganised its entire procurement philosophy around collaboration and target cost, in the explicit name of efficiency, is now the most expensive place in Europe - arguably the world - to build infrastructure.

Two honest caveats are owed here, and a hostile reader will reach for them first. The unit-cost gap has many causes that have nothing to do with how the work was contracted: land acquisition and compensation, the direct cost of consenting and environmental mitigation, higher standards and specification, tunnelling and geology, and a stop-start funding pipeline that forfeits the savings of continuity. And HS2 is a single, extreme data point, not a population. But neither caveat rescues the orthodoxy; both sharpen the charge. If the cost gap is driven mainly by these structural factors, then the contract form was never the lever its advocates implied, and collaboration was being asked to carry weight it could not bear. The honest reading is not that target cost caused the gap - it is that British practice reorganised itself around target cost in the name of closing a gap that target cost did nothing to close. Cost-competitiveness against lump-sum Europe is conspicuously not what it delivered.

The flagship NEC projects confirm the picture

If target cost were the cost-discipline mechanism it is sold as, the UK's largest programmes ought to be the showcase. They are the opposite. Three megaprojects are not a population, and I come below to the routine, repeatable work where target cost genuinely earns its keep. But these are the schemes the orthodoxy most needs to be able to point to, and on its three biggest tests it cannot.

Crossrail ran on NEC3 target cost, with tier-one contractors sharing 50% of savings and 50% of overruns.⁶ It opened in May 2022 rather than December 2018, with costs rising from around £14.8bn to over £18bn, and the National Audit Office attributed around £900m of the rise between 2013 and 2018 to settling historic contractor claims, on contracts that generated tens of thousands of compensation-event notices.⁷ The incentive geometry was textbook; the outcome was a multi-year delay and a multi-billion-pound overrun.

HS2 shows how a target cost contract can be one in name only. The Main Works Civils Contracts were, on the government's own description, NEC3 Option C target cost contracts.⁸ Yet the incoming chief executive, Sir Jon Thompson, told MPs in 2023 that the main works civils contracts were the principal driver of the latest escalation, accounting for 89% of the increase between the Department's spring estimate of £44.6bn and the then-current figure. He criticised the decision to let them on a cost-plus basis with "very few incentives or penalties", noting that a contractor spending 100% more than originally agreed would suffer only a 1% reduction in fee. The reported increase on those civils contracts was around £6.1bn, with projected final costs rising to £21.8bn-£23.4bn.⁹ The position has not improved since: in June 2026 the National Audit Office reported the reset programme's cost at £87.7bn to £102.7bn, roughly double the 2020 estimate.³⁰ Strip the pain share down to a rounding error and a target cost contract is simply cost reimbursement in collaborative costume. This is the place to be precise about the charge, because the obvious rejoinder is that HS2 and the rest were not "really" target cost contracts at all, so the form is exonerated. That rejoinder fails - and noticing why is the whole point. The objection is not that the label was misapplied; it is that the form permits this. A target cost contract can be hollowed to cost-plus while the collaborative language stays intact, and an orthodoxy that treats the label as a guarantee of discipline is exactly what lets it happen. The instrument is only ever as good as the client administering it. That is not a defence of the instrument; it is the argument against relying on it as one.

Hinkley Point C completes the set. EDF based most of its contracts on the NEC3 suite, with the main works on NEC3 ECC Option C and over 75% of the project footprint delivered through NEC forms.¹⁰ The cost has roughly doubled, to around £35bn in 2015 prices - some £46-48bn in cash terms - with Unit 1 now slipping to 2030.¹¹

The courts have seen the same drift in miniature. In Secretary of State for Defence v Turner Estate Solutions the target cost machinery broke down when the parties stopped operating the change procedure, and the contractor's costs ran almost £70m above the maximum price while the target adjustment process sat idle.¹² The mechanism does not enforce itself; it demands disciplined administration that its own complexity makes harder to sustain.

The case NEC makes for itself

In fairness, the body that publishes the NEC does not shy from the comparison; it maintains a library of success stories, and they deserve a hearing. The genuine standout is the A14 Cambridge to Huntingdon improvement scheme - a roughly £1.5bn upgrade contracted on NEC3 ECC Option C, which opened in May 2020 around eight months ahead of schedule and on budget, and did so through the first wave of the pandemic.¹³ That is a large, one-off scheme delivered well under a target cost contract, and it is independently corroborated rather than merely asserted; it belongs in any honest account, and it cuts against a lazy version of the case I am making.

Beyond it, the showcase thins quickly. NEC's featured cases run to a lift-retrofit programme and a stormwater scheme in Hong Kong, a £242,000 saving on a corridor improvement in Barnsley, a leisure pool in Rushden, a boardwalk, and the genuinely impressive three-week build of the NHS Nightingale hospital.¹⁴ These are real, but they are mostly small to mid-sized; the claims are self-submitted and promotional, attributed to the NEC by the projects' own managers with no independent verification. Most telling is the omission: Crossrail, HS2 and Hinkley Point C - three of the largest NEC target cost projects ever let - do not appear among the success stories. An evidence base that showcases a £242,000 saving in Barnsley while passing over £6bn of overrun on HS2 is advocacy, not assessment.

And the pattern in NEC's own best evidence is the very one the European comparison points to. The A14 succeeded with a permanent, expert public client that builds roads continuously (Highways England, now National Highways), a mature and well-understood project type, and an integrated delivery team - the conditions under which collaboration genuinely pays. It is the exception that states the rule: target cost works where the client and the work are already disciplined, and fails where it is asked to substitute for that discipline.

The discipline of honesty: lump-sum Europe is no panacea

Here a sceptic must be sceptical in both directions, because the simple inference - that Britain should abandon target cost and adopt continental lump-sum - does not survive contact with the European record.

The cleanest test available is nuclear, because the same reactor was built in three countries under three contracting cultures. Britain built Hinkley under NEC3 target cost. France built Flamanville 3 under its own arrangements: an estimated €3.3bn and four years became €13.2bn and more than a decade late.¹⁵ Finland built Olkiluoto 3 under the opposite of target cost - a fixed-price €3.2bn turnkey contract under which the contractor, Areva, was to absorb any overrun. The plant came in at around €11bn and roughly 14 years late, the overruns helped destroy Areva as an independent company, and the dispute ended only after years of billion-euro claims and counter-claims.¹⁶ Three reactors, three contract models, three catastrophes. If the fixed-price turnkey form were the answer, Olkiluoto would be the proof; instead it is the warning.

Germany, the home of detailed design and fixed-price contracting, has its own catalogue. Berlin Brandenburg Airport opened nine years late at roughly triple its early budget; Stuttgart 21, its opening pushed to 2031 after the 2026 date was cancelled, is heading for some €14.5bn and is still not open; Hamburg's Elbphilharmonie overran by nearly tenfold.¹⁷Lump-sum discipline did not save any of them.

The reason is the one established by Bent Flyvbjerg's data across more than a hundred countries: the "iron law of megaprojects" - over budget, over time, over and over again. Nine in ten megaprojects exceed budget, overruns of up to 50% in real terms are common, and the pattern has held constant for seventy years across every geography and every ownership model.¹⁸ On one-off megaprojects, the contract form is a second-order variable. It does not cure optimism bias, strategic under-estimation at business-case stage, scope immaturity at the point of commitment, or political schedule pressure - and these are what wreck large projects, in Somerset and in Finland alike.

So what does explain the gap?

If the contract form is not the difference, what is? The European builders who deliver cheaply share a profile, and it is not a contractual one. Spain - the standout - builds fast (less time exposed to inflation and political change), standardises designs across a long pipeline, streamlines consenting, and sustains a capable, continuous public client; on the Madrid metro the gap between finishing construction and opening a line was measured in weeks, not years of testing.¹⁹ The lesson is repetition, standardisation, speed and client capability, not the colour of the contract.

Tellingly, the UK's own genuine successes - the A14 among them - fit the same pattern and not the orthodox one. The London 2012 Olympic Park was delivered on time and, famously, "under budget" - but under a budget that had been reset from a bid-stage figure of around £2.4bn to a £9.3bn funding package in 2007, and delivered by an exceptionally capable client (the Olympic Delivery Authority) against an immovable deadline.²⁰ Anglian Water's @one Alliance, the model most cited in the Construction Playbook, has delivered real efficiencies - but it is programmatic, repeat water-capex work run by a sophisticated, continuous client over two decades, which is precisely the context in which collaboration pays.²¹In both cases the contract form is downstream of the thing that actually delivered: a capable client doing repeatable work with mature design.

Why Britain reaches for target cost

There is a serious structural defence of the UK's preference, and it deserves to be met head-on rather than waved away. For nationally significant infrastructure, consent comes through the Development Consent Order regime under the Planning Act 2008 - and a DCO is not granted on a fixed design. It is granted on a parameters envelope, the so-called Rochdale Envelope, assessed on a worst-case basis, with detailed design deliberately left to vary post-consent within limits of deviation and requirements.²² The scheme that is consented is, by design, not the scheme that is drawn. Layer on the litigation risk - roughly a quarter of DCOs have faced judicial review, each challenge taking around 1.4 years even though only a handful have ever succeeded - and the early-stage uncertainty is real and partly irreducible.²³ In that world, appointing a contractor early to help define what is buildable within the envelope, under a target cost contract that can flex as the design firms up, is not laziness; it is a rational adaptation to a consenting system that withholds design certainty until late. Early contractor involvement has a genuine logic here, and the policy bodies that promote it - the Infrastructure and Projects Authority (since April 2025 part of NISTA), the Construction Playbook - are not wrong that catching buildability problems before they are drawn has value.²⁴

There is a further twist that makes the consenting regime not merely a source of uncertainty but a source of built-in conflict. To secure a robust consent, the client must define and assess the scheme on a worst-case basis: the envelope is, deliberately, the most onerous version of the project, and stacking multiple worst cases together can produce a development scenario that is itself unrealistic.²⁵ But the business case and the budget that justified the project to the Treasury are built on the opposite instinct - optimistically costed, affordability-constrained, with contingency squeezed to fit the funding envelope rather than the worst-case scope.²⁶ The result is a scissors. What has been consented, and environmentally committed to, is maximal and conservative; what has been funded is realistic-to-optimistic; and the two were never the same scheme. A target cost contract let against that position inherits the gap on day one: the contractor anchors to the onerous, still-fluid consented scope and prices risk into it - or into the target - while the client is anchored to a budget that assumed the affordable version. The pain-and-gain mechanism then begins life measuring performance against a target that was misaligned with the budget before a spade went in the ground, which is precisely the condition under which target cost regimes generate disputes rather than resolve them.²⁷ The strategic misalignment is not a failure of execution that good administration might cure; it is wired in at the point of consent.

But notice what that defence does and does not cover. It justifies target cost for the genuinely undefinable residue - the part of the design the consenting regime really does keep open. It does not justify using target cost as a blanket substitute for defining the parts that were always within the client's gift. And this is where the British problem actually lives. HM Treasury and IPA (now NISTA) work on major projects records the chronic pattern: schemes moving forward before scope and benefits are properly defined, reliance on immature early estimates, blurred accountability and systematic optimism bias - the very failings the 2026 Green Book revision is meant to address at the front end.²⁸ A great deal of what is blamed on irreducible consenting uncertainty is in fact ordinary under-definition: a client that never did the work to draw a stable requirement, and reached for a contract form that did not require one.

The two causes are connected, and that connection is the heart of the matter. The genuine uncertainty created by the consenting regime supplies respectable cover for the self-inflicted uncertainty created by weak client definition. A disciplined client can reach a workable baseline despite the DCO regime - Highways England did on the A14¹³, because roads are a well-understood product and the client did the definition; Spain does it across an entire high-speed-rail programme, because it standardises and consents fast.¹⁹ The under-defined bespoke megaproject blames the planning system for an immaturity that is substantially its own. Target cost, by accommodating both the real uncertainty and the manufactured kind without distinguishing between them, quietly removes the pressure that would otherwise force the client to fix the part it controls.

And there is a price to this even where early involvement is justified, which the enthusiasm tends to skip. Appoint a contractor before the supply chain is priced and the final cost is, by definition, unknown; there is no competitive tension on price, and the client must take the contractor's numbers substantially on trust.²⁴ And trust is the wrong word for the position the client is in, because the relationship is asymmetric in expertise as well as information. The major contractors field deep benches of commercial managers, quantity surveyors and claims specialists whose full-time business is the operation of these contracts; the client rarely matches them in-house, and the third-party consultants it hires instead, however able, are outnumbered and out-specialised by the people across the table. Open-book transparency assumes a client that can read the book. A client that cannot is not collaborating; it is being shown what it is given. You are trading cost certainty for buildability input - a trade worth making for genuinely irreducible uncertainty, and a poor one when the uncertainty is simply work the client did not do. Tellingly, the sector still lacks the project-level data to show that earlier appointment actually delivers the cost and time benefits claimed for it.²⁴

The real charge against UK target cost

Pull these threads together and the contention earns its keep. The problem is not that target cost contracts are bad instruments. It is that Britain reached for them as a substitute for the disciplines the cheap European builders kept. A target cost contract lets a client start before the design is mature, because the price is provisional by design. It defers cost certainty, which is convenient for a sponsor who wants to announce a project before it is properly defined. And it appears to outsource cost discipline to a pain-share mechanism - which, as HS2 demonstrates, is too often set so soft that it disciplines no one. The collaborative rhetoric supplied a respectable language for proceeding without the things that make projects cheap: completed design, standardisation, a continuous and capable client, and a programme rather than a parade of bespoke one-offs.

Beneath this sits a behavioural mechanism the collaborative account politely ignores. Target cost is a bargain: the client opens the books and shares the upside, and the contractor, in return, is meant to subordinate its own commercial interest to the project's. The contract form cannot compel that good faith; it can only invite it - and the invitation is routinely declined. Faced with a target it can influence, a change procedure it can work, and a client it out-resources, a rational contractor protects its margin first and the project second: pricing risk generously into the target, mining compensation events, and conceding only what the administration of the contract forces it to. This is not deviance; it is the predictable response of a commercial party to an instrument that rewards it. The collaborative label dresses an adversarial reality in cooperative clothes, and the inequitable balance it creates is, more often than not, exploited. The pain share was meant to hold the two sides together; where it is set soft, as at HS2, the alignment is fictional and only one side is really playing the game.

Set against the European mirror, the indictment is specific. Continental lump-sum practice, for all its adversarial reputation, forces the client to finish the design before committing and to confront a real price up front. It is no guarantee against failure on one-off megaprojects - Olkiluoto and BER prove that. But on the routine, repeatable majority of work it imposes a discipline that Britain has allowed its collaborative model to relax. The result is visible in the only number that compares cleanly: Britain builds the most expensive railways in Europe.

An honest scorecard

Intellectual honesty requires stating the limits. Clean, like-for-like outcome comparisons between UK and European delivery barely exist outside the rail-cost data, because projects differ too much in ground, governance and politics; and the academic literature on the NEC, after thirty years, still rests largely on practitioner-satisfaction surveys rather than systematic outcome evidence - by its own admission, no comprehensive objective performance-evaluation model exists.²⁹ That cuts against complacency on all sides. It also means the confident claim that target cost delivers better outcomes - the claim that has hardened into the Construction Playbook and into a quiet British sense of superiority - rests on no firmer ground than the contrarian case, and arguably less.

A particular word on NEC4. The 2017 edition is the form now being mandated, yet essentially all the evidence, good and bad, concerns NEC3. No NEC4-era megaproject has completed and been independently evaluated. "NEC4 has been good for clients" is, at present, an extrapolation and a marketing proposition, not a finding.

So the scorecard reads as follows. Target cost contracting is a sound tool in its proper place: genuinely uncertain scope, real early-contractor buildability value, a capable client, and a pain share hard enough to bite. Used that way - on programmatic, repeatable work by a strong client - it can help, as Anglian Water shows. Adopted as a general philosophy, and as a substitute for design maturity and client capability on one-off megaprojects, it has coincided with the worst infrastructure cost performance in Europe. The lesson from the Continent is not "switch to lump-sum"; Olkiluoto forbids that conclusion. It is that the contract form is downstream of capability, and that Britain spent thirty years optimising the contract while letting the capability decay.

The case against target cost contracts is weak. The case against the case for them - the collaborative orthodoxy that let Britain mistake a procurement preference for a delivery strategy - is, measured against Europe, strong. Thirty years after Latham, the most useful thing the industry could do is stop confusing collaboration with proof, rebuild client capability and design discipline, and choose contract forms on the evidence rather than the orthodoxy.

Sources

1. Latham, M. (1994) Constructing the Team; the 30% cost-reduction target, Designing Buildings Wiki, "Latham Report", https://www.designingbuildings.co.uk/wiki/Latham_Report
2. Egan, J. (1998) Rethinking Construction; overview, Metroun, https://metroun.co.uk/post/egan-report-recommendations-and-effects-on-the-uk-construction-industry/
3. Building, "Latham's report: Did it change us?" (missed 30% target; ~7% NEC share in the 2010 RICS survey; reversion to lowest-price tendering), https://www.building.co.uk/focus/lathams-report-did-it-change-us/5069333.article
4. Transit Costs Project (NYU Marron Institute), high-speed rail data analysis (HS2 ~$232m/km as the most expensive in the database; Wendlingen-Ulm ~$71m/km; Lyon-Turin ~$130m/km), https://transitcosts.com/high-speed-rail-preliminary-data-analysis/ (this HSR analysis is the primary source; note the TCP page supports HS2 as the most expensive line per km and that high UK cost is not explained by tunnelling/elevation, but does not itself run a full normalisation by bridges, GDP and time) ; see also New Civil Engineer, "Ferrovial boss on why high speed rail costs more in UK", https://www.newcivilengineer.com/latest/ferrovial-boss-on-why-high-speed-rail-costs-more-in-uk-12-07-2022/
5. Illustrative Spanish high-speed-rail unit costs (Madrid-Seville to Madrid-Valladolid, low tens of millions of euros per km, below Germany and Italy), "How Madrid built its metro cheaply", Works in Progress, https://worksinprogress.co/issue/how-madrid-built-its-metro-cheaply/ ; and High-speed rail in Spain, Wikipedia, https://en.wikipedia.org/wiki/High-speed_rail_in_Spain . NB: figures are different vintages and currencies from [4-2] and are indicative, not directly comparable.
6. Construction Enquirer, "Crossrail contractors must stump up 50% of cost over-runs" (17 Feb 2011), https://www.constructionenquirer.com/2011/02/17/crossrail-contractors-must-stump-up-50-of-cost-over-runs/
7. International Railway Journal, "Crossrail: behind schedule, over budget and under pressure" (£14.8bn to £18bn+; 2018 to 2022 slip), https://www.railjournal.com/in_depth/crossrail-behind-schedule-over-budget-and-under-pressure/ ; Construction News, "Crossrail: A history of missed deadlines and cost overruns" (NAO £900m compensation events; PAC findings), https://www.constructionnews.co.uk/civils/crossrails-history-missed-deadlines-cost-overruns-12-11-2019/
8. UK Parliament, Written Question HL8035 (HS2 Main Works Civils as defined-cost, incentivised, two-stage design-and-build based on the NEC3 Option C target cost model), https://questions-statements.parliament.uk/written-questions/detail/2025-06-03/HL8035/
9. Primary source for the quoted figures: House of Commons Public Accounts Committee, oral evidence on HS2 (Sir Jon Thompson, 2023) - the "very few incentives or penalties" / cost-plus criticism, the 1% fee reduction for a 100%-over-budget contractor, and the 89% of the increase between the Department's spring estimate of £44.6bn and the then-current estimate (note: the official quote ties the 89% to the £44.6bn spring estimate, not to "2020"). The ~£6.1bn increase on the Main Works Civils Contracts and the £21.8bn-£23.4bn projected final cost are from trade-press reporting and are not worded that way in the official evidence: Construction Enquirer, "New HS2 boss blasts cost-plus contracts for £6bn of overspend" (17 Nov 2023), https://www.constructionenquirer.com/2023/11/17/new-hs2-boss-blasts-cost-plus-jobs-for-6bn-of-overspend/ ; New Civil Engineer, 17 Nov 2023, https://www.newcivilengineer.com/latest/hs2-phase-1-cost-close-to-exceeding-benefit-as-officials-blame-civils-contracts-17-11-2023/
10. NEC, "NEC plays a key role on Hinkley Point C project" (EDF commercial director Ken Owen: the main works are "mostly being procured under the NEC3 Engineering and Construction Contract Option C, target contract with activity schedule", and "NEC will cover over 75% of the contract footprint"), https://www.neccontract.com/news/nec-plays-a-key-role-on-hinkley-point-c-project ; later services on NEC4 ALC, https://www.neccontract.com/news/nec4-alc-adopted-for-hinkley-point-c-services . (The Hinkley PSG information sheet previously cited has moved; the same "NEC3 Contracts" sheet is now at https://www.nuclearpsg.co.uk/information_sheets/nec3-contracts/.)
11. New Civil Engineer, "Hinkley Point C's cost climbs to £35bn" (£35bn in 2015 prices; Unit 1 2030), https://www.newcivilengineer.com/latest/hinkley-point-cs-cost-climbs-to-35bn-with-confirmation-unit-1-will-power-up-in-2030-20-02-2026/ ; NucNet, "UK nuclear station could be delayed to 2031 and cost up to £46 billion", https://www.nucnet.org/news/uk-nuclear-station-could-be-delayed-to-2031-and-cost-up-top-gbp46-billion-says-edf-1-3-2024
12. Secretary of State for Defence v Turner Estate Solutions Ltd [2015] EWHC 1150 (TCC) (TCC, 30 April 2015) - TES engaged on a maximum-price target cost contract at HMNB Clyde (Faslane); by 2015 its actual costs were almost £70m above the maximum price, and it argued the target cost / maximum price / pain-gain mechanism had fallen away because the parties stopped operating the target cost adjustment process. CMS, "Target practice: can target cost become cost plus?", https://cms.law/en/gbr/legal-updates/Target-practice-can-target-cost-become-cost-plus ; case report, swarb.co.uk, https://swarb.co.uk/secretary-of-state-for-defence-v-turner-estate-solutions-ltd-tcc-30-apr-2015/
13. NEC, "A14 Cambridge to Huntingdon improvement scheme, UK" (NEC3 ECC Option C; ~£924m of works/consultancy packages within a ~£1.5bn scheme; completed on budget and ahead of programme), https://www.neccontract.com/projects/a14-cambridge-to-huntingdon-improvement-scheme-uk ; independently corroborated by New Civil Engineer, "How the A14 upgrade was completed eight months early amid a global pandemic" (12 Jan 2021), https://www.newcivilengineer.com/latest/how-the-a14-upgrade-was-complete-eight-months-early-amid-a-global-pandemic-12-01-2021/
14. NEC project case-study library (featured cases include the A6195 Barnsley corridor improvement, £242,000 saving; Hong Kong universal-accessibility lift retrofits and the Happy Valley stormwater scheme; Splash Leisure Pool, Rushden; East Coast Boardwalk, Hong Kong; NHS Nightingale Hospital, three-week build; Sydney Water P4S, NEC4), https://www.neccontract.com/Case-Studies ; A6195 Barnsley, https://www.neccontract.com/projects/a6195-corridor-improvement-works-barnsley-uk
15. POWER, "EDF Announces More Delays, Cost Overruns for Flamanville 3 Reactor" (€3bn/4 years to €13.2bn and 12+ years), https://www.powermag.com/edf-announces-more-delays-cost-overruns-for-flamanville-3-reactor/ ; NucNet, https://www.nucnet.org/news/edf-announces-further-delay-and-eur500-million-cost-overrun-12-2-2022
16. World Nuclear News, "Olkiluoto 3 EPR parties agree settlement", and Olkiluoto Nuclear Power Plant, Wikipedia (fixed-price €3.2bn turnkey contract signed Dec 2003 with Areva NP/Siemens; overruns to ~€11bn; ~14 years late; settlement of billion-euro claims), https://www.world-nuclear-news.org/Articles/Olkiluoto-3-EPR-parties-agree-settlement and https://en.wikipedia.org/wiki/Olkiluoto_Nuclear_Power_Plant ; World Nuclear Report, "Europe's First EPR: 13 Years Behind Schedule", https://www.worldnuclearreport.org/Europe-s-First-EPR-13-Years-Behind-Schedule-Olkiluoto-3-in-Finland-Starts-Up
17. Berlin Brandenburg Airport (opened Oct 2020 vs 2011 plan; cost roughly tripled), Stuttgart 21 (the December 2026 opening was cancelled in 2025; Deutsche Bahn now confirms opening in 2031 at a cost of ~€14.5bn; still not open), and Elbphilharmonie (~900% overrun, €77m budget to ~€789m final): "Cost overruns and delays in infrastructure projects: the case of Stuttgart 21", DiVA, https://www.diva-portal.org/smash/get/diva2:1474961/FULLTEXT01.pdf ; Hertie School, "Large Infrastructure Projects in Germany", https://www.hertie-school.org/fileadmin/2_Research/2_Research_directory/Research_projects/Large_infrastructure_projects_in_Germany_Between_ambition_and_realities/1_WP_Cross-SectoralAnalysis.pdf
18. Flyvbjerg, B., "The Iron Law of Megaprojects" (nine in ten over budget; overruns up to 50% in real terms common; constant over 70 years; all countries and continents, public and private), https://medium.com/data-science/the-iron-law-of-megaprojects-18b886590f0b ; and Flyvbjerg, B. (2014) "What You Should Know About Megaprojects and Why: An Overview", Project Management Journal, https://arxiv.org/abs/1409.0003
19. "How Madrid built its metro cheaply", Works in Progress (speed, standardisation, streamlined consenting, three-week construction-to-opening window, capable continuous client), https://worksinprogress.co/issue/how-madrid-built-its-metro-cheaply/
20. NEC, "London 2012 Olympic Park" (100+ NEC3 contracts; on time; ~£600m saved), https://www.neccontract.com/projects/london-2012-olympic-park ; NAO, "The London 2012 Olympic and Paralympic Games: post-Games review" and "The budget for the London 2012 Olympic and Paralympic Games" (£9.3bn Public Sector Funding Package set in March 2007, up from a bid-stage estimate of ~£2.4bn; delivered under the revised baseline), https://www.nao.org.uk/wp-content/uploads/2012/12/1213794fr.pdf and https://www.nao.org.uk/reports/the-budget-for-the-london-2012-olympic-and-paralympic-games/
21. Binnies, "Anglian Water's @one Alliance" (NEC alliance, Construction Playbook exemplar, programmatic AMP7/AMP8 water capex, efficiency savings), https://binnies.com/frameworks/anglian-waters-one-alliance/ ; New Civil Engineer, "How @one Alliance's model and lessons learned could improve delivery of its £2.6bn AMP8 portfolio", https://www.newcivilengineer.com/in-depth/how-one-alliances-model-and-lessons-learned-could-improve-its-amp8-2-6bn-portfolio-delivery-30-01-2025/
22. On the Rochdale Envelope and post-consent design flexibility in the DCO regime (consent granted on a worst-case parameters envelope, with detailed design varying post-consent within limits of deviation and requirements): Planning Inspectorate / NSIP guidance and design-principles documents, e.g. https://www.gov.uk/guidance/nationally-significant-infrastructure-projects-advice-on-preparing-applications-for-linear-projects ; and the NIPA/UCL report "Infrastructure Delivery: the DCO process in context" (Morphet and Clifford, 2017), https://nipa-uk.org/wp-content/uploads/2023/08/UCL_Morphet_and_Clifford_-_NIPA_Main_Report_-_June_2017.pdf
23. Independent Review into Legal Challenges against Nationally Significant Infrastructure Projects (the Banner Review, 2024): of ~30 challenges to the grant of a DCO (against ~135 DCO decisions, c.22%), only four have ever succeeded (Banner, para 32). NB the c.1.4-year average duration and the reform programme are drawn from the accompanying government material (Written Ministerial Statement, 23 Jan 2025), not the Banner report's own caseload tables, which give stage durations in weeks; the related judicial-review reforms were taken forward through the Planning and Infrastructure Act 2025 (the Act received Royal Assent on 18 December 2025: LexisNexis, "Planning and Infrastructure Act 2025 receives Royal Assent", https://www.lexisnexis.co.uk/legal/news/planning-infrastructure-act-2025-receives-royal-assent). https://www.gov.uk/government/publications/independent-review-into-legal-challenges-against-nationally-significant-infrastructure-projects/independent-review-into-legal-challenges-against-nationally-significant-infrastructure-projects
24. On the rationale for, and limits of, early contractor involvement (IPA/Construction Playbook support; reduced cost certainty when the supply chain is unpriced, loss of competitive tension): Metroun, "Early Contractor Involvement (ECI) Explained", https://metroun.co.uk/post/early-contractor-involvement-eci-explained/ ; Binnies, "The Strategic Advantage of Early Contractor Involvement in Infrastructure Projects", https://binnies.com/early-contractor-involvement-infrastructure/ . NB the frequently-cited "~7% cost / ~10% time" ECI benefits are widely repeated in industry commentary but are not traceable to a primary study and should be read as an unattributed industry figure. On the absence of measured, project-level evidence for appointment-timing benefits (the literature rests on client-perception surveys), see the 2024 ECI client-perception study, International Journal of Construction Management, https://www.tandfonline.com/doi/abs/10.1080/15623599.2024.2408179
25. Planning Inspectorate, "Advice Note Nine: Rochdale Envelope" (assessment of the project on a worst-case / maximum-parameters basis), https://www.gov.uk/government/publications/nationally-significant-infrastructure-projects-advice-note-nine-rochdale-envelope/nationally-significant-infrastructure-projects-advice-note-nine-rochdale-envelope . The further point that stacking multiple worst cases can produce an unrealistically onerous combined scenario is a recognised EIA "realistic worst case" practitioner principle rather than an explicit statement in Advice Note Nine itself
26. On optimistically set, affordability-constrained budgets (optimism bias in business cases; contingency limited by the budget envelope; standard Green Book / Treasury uplifts): "Optimism Bias and Contingency at Homes England", GOV.UK, https://www.gov.uk/government/publications/optimism-bias-and-contingency-at-homes-england/optimism-bias-and-contingency-at-homes-england-accessible-version ; and Flyvbjerg, "From Nobel Prize to Project Management: Getting Risks Right", https://arxiv.org/pdf/1302.3642
27. On target cost regimes generating disputes where the target is set against a baseline that was never realistic for the actual scope: Foot Anstey, "An introduction to Target Cost Contracts", https://www.footanstey.com/our-insights/articles-news/an-introduction-to-target-cost-contracts/ ; and "Target Cost Contract: How It Works, Pain/Gain Share and Key Risks", https://constructionfront.com/target-cost-contract/
28. HM Treasury, The Green Book and major-projects guidance on front-end definition and optimism bias (schemes proceeding before scope and benefits are properly defined; unreliable early estimates; the 2026 Green Book revision strengthening front-end clarity), https://www.gov.uk/government/publications/the-green-book-appraisal-and-evaluation-in-central-government ; see also the Lords Library briefing on the Green Book review, https://lordslibrary.parliament.uk/governments-green-book-review-and-reforms/
29. On the perception-based and incomplete NEC evidence base: NZ ECC case study, Rooke/Wright (ScienceDirect), https://www.sciencedirect.com/science/article/abs/pii/S0263786308000483 ; and the Hong Kong NEC performance-index Delphi study, which notes that few if any comprehensive, objective, systematic NEC performance-evaluation models exist, International Journal of Construction Management, https://www.tandfonline.com/doi/abs/10.1080/15623599.2022.2100058
30. National Audit Office, High Speed Two reset, HC 52, 29 June 2026, para 8 (cost of £87.7bn-£102.7bn, about double the 2020 estimate; mixed price base), https://www.nao.org.uk/wp-content/uploads/2026/06/high-speed-two-reset-summary.pdf. Added in the September 2026 update.