HM Treasury has changed the Green Book so public investment decisions can consider wider economic and social effects, which is excellent news for every benefit that cannot be squeezed neatly into a column. The guidance was updated in February and, on 30 June 2026, the Treasury said the reforms would help projects across the UK receive a fairer hearing. The measuring tape has left the courtroom. It is now being asked to explain its feelings about regional growth.
The Green Book is government guidance for judging whether investment offers value for money. The latest announcement says decisions should no longer rely only on single measures such as benefit cost ratios. Business environments, innovation and wider effects on local growth can now join the conversation, presumably after being searched for unauthorised adjectives.
The Treasury also announced findings from an independent review of the discount rate, streamlined guidance for developing business cases and a reduction of more than half in the paperwork involved. This is being described as cutting through government sludge. Somewhere in Whitehall, the fictional senior official Martin Pile is holding a ceremonial shredder and waiting for its environmental impact statement.
Place based business cases are being developed with regional leaders in Plymouth, Birmingham, Liverpool and Port Talbot. The stated aim is to put local priorities and expertise at the centre of appraisal. A town may therefore be allowed to explain what it needs before a spreadsheet from three counties away explains why it needs something else.
The reforms also promise more consistent publication of business cases, allowing the public to see how major decisions are made. That sounds straightforward until a document reaches 400 pages and begins with a glossary explaining that clear is a technical term. Transparency has arrived, carrying a smaller document that explains how to read it.
There is a serious point beneath the comedy. Investment decisions should account for long term and local consequences, while the public should be able to understand the reasoning behind them. A narrow measurement can look wonderfully precise while missing the road, town or workforce being measured.
Still, the Green Book has not abolished bureaucracy. It has merely taught bureaucracy to consider the wider social impact of producing more bureaucracy. The next business case will ask whether its own business case represents value for money, then send the answer to a committee formed to assess the committee. At last, public spending has found a way to invest in itself.
Source: GOV.UK.
