LONDON — Britain is changing the way it evaluates long-term public infrastructure investments, in a move the government says could make major projects more attractive and help unlock investment across the country.
HM Treasury announced on September 4 that it plans to reduce the discount rate used in government appraisals from 3.5% to 3%, giving greater weight to economic and social benefits that may take decades to materialise.
The change forms part of reforms to the UK’s Green Book, the Treasury’s framework for assessing the costs, benefits and risks of government projects.
Why the discount rate matters
The discount rate is essentially a way of comparing money and benefits received at different points in time.
Under the previous approach, benefits expected far into the future were reduced significantly when calculating their value today. A lower rate means those future benefits are discounted less heavily.
That could make long-term projects — particularly transport, housing and social infrastructure — look more economically worthwhile when government investment decisions are made.
The Treasury said the reform is intended to give projects whose benefits take years to emerge a fairer hearing in spending decisions.
A broader approach to regional investment
Britain is also testing a different way of evaluating investment opportunities.
Instead of looking at projects individually, the government is piloting an approach that examines the economic potential of entire areas.
The pilot programme covers Plymouth, Liverpool, Birmingham and Port Talbot, where officials are developing place-based investment cases designed around local economic priorities.
The idea is to identify how multiple investments — such as housing, transport, skills and infrastructure — can work together to generate stronger economic growth than projects considered separately.
This follows wider planning reforms
The latest Green Book announcement comes after Britain introduced separate reforms designed to speed up the approval process for major infrastructure projects.
Under changes to the Planning and Infrastructure Act, the government said mandatory pre-application consultation requirements for Nationally Significant Infrastructure Projects would be removed, while developers would receive earlier technical advice from the Planning Inspectorate.
The government estimates the changes could cut as much as 12 months from parts of the pre-application process and potentially save industry about £1 billion during the current Parliament.
Officials have also set a target of making decisions on at least 150 major economic infrastructure projects during this Parliament — nearly three times the 59 Development Consent Order decisions made during the previous Parliament, according to the government.
Why the timing matters
The reforms arrive as Britain tries to encourage investment while facing a difficult economic backdrop.
The British Chambers of Commerce recently said the UK economy was expected to grow somewhat faster than previously forecast in 2026, but warned that growth remained subdued and that businesses were still cautious about investment.
At the same time, borrowing costs remain an important constraint. Reuters reported this week that Britain’s 10-year government bond yield had climbed to its highest level since 2007, highlighting the pressure higher financing costs can place on government spending.
Against that backdrop, changing the way long-term projects are evaluated could have significant consequences for which investments are judged to deliver sufficient value.
The bigger picture for infrastructure
Britain’s infrastructure push spans areas including transport, housing, energy and other major public projects.
The government says its broader planning reforms could support up to £7.5 billion of additional economic activity over the next decade, while projects already approved or in the pipeline are expected to create tens of thousands of jobs.
But the changes do not mean every major project will automatically receive approval or funding.
The Green Book remains an appraisal framework rather than a mechanism that guarantees government spending. Projects still have to demonstrate value, manage risks and compete for limited public resources. The Treasury itself describes the Green Book as a framework for producing evidence-based advice rather than setting government policy objectives.
What happens next?
The government is expected to provide more details on the revised approach and its response to the independent discount-rate review at the October 28 Budget.
Finance Minister John Healey is also expected to outline further details of the government’s investment strategy in a major speech.
For investors and businesses watching Britain, the significance could extend beyond a single change to an accounting formula.
If long-term economic benefits receive greater weight and major projects can move through planning more quickly, the combined effect could be to make more infrastructure schemes viable — potentially opening the door to greater public and private investment.
The real test, however, will come when these reforms begin influencing which projects actually receive the green light — and how much money follows.
WWC ONE MEDIA J.M.S
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