English mayors’ growth-finance plans: borrowing powers are only part of the equation

Reuters reports that the government plans a £1.5 billion borrowing facility for English mayors.¹

The Budget is scheduled for October 28.² The proposals must therefore be read as a pre-Budget package, not evidence that the money has already been allocated to projects or spent. For local economies, the central issue is how greater freedom to choose investments would interact with repayment obligations, project appraisal and delivery capability.

Archive photograph: the HM Treasury building plaque. © Crown copyright. Source: UK government announcement; Open Government Licence v3.0.

What the official announcement establishes

The government’s October 22 statement confirms a related direction of travel: reforming the Green Book framework used to assess public investment and preparing a roadmap for fiscal devolution. The latter would set out plans for regional leaders to decide how a share of some national taxes is allocated. The statement does not independently establish the funding amounts reported above.³

The investment reform aims to consider the needs of a place more coherently. Housing, transport and other proposals can be connected parts of a local growth problem rather than unrelated applications. The government argues that examining them together can reveal benefits missed when individual projects are considered separately. It also says No10 North will support areas without mayors in preparing business cases, so the appraisal initiative should not be read as exclusively available to mayoral areas.

These are different levers. A roadmap for allocating tax resources, access to borrowing and a revised appraisal process do not perform the same function. The first concerns control over resources; the second brings financing and an obligation to repay; the third informs which investments are worth pursuing. Their practical effect will depend on the eventual rules, not simply on their appearance in the same package.

Borrowing is not a grant

The distinction matters because England already has a framework for local-authority capital finance. Government guidance describes the Prudential Framework, in place since 2004, as giving local authorities considerable freedom to borrow and invest while requiring prudent, affordable and sustainable decisions. Its minimum revenue provision, or MRP, requires relevant authorities to set money aside each year for capital expenditure financed by debt, helping ensure that repayment remains affordable.⁴

That guidance explains the existing system; it is not proof that every term of the proposed facility has already been settled. Interest rates, maturities, access criteria, allocation between places and the treatment of revenue shortfalls are material questions for the eventual design. A headline lending capacity cannot be treated as an equal amount of non-repayable support.

Nor should economic benefit and debt-service income be confused. A transport connection may make jobs easier to reach and support local activity without all of those gains becoming cash available to the borrowing authority. This is an analytical distinction, not a prediction about a particular project. A viable funding plan needs to show which revenues or budget resources actually meet repayment costs, including under less favourable conditions.

Joined-up projects still need disciplined appraisal

The Green Book’s 2026 guidance defines appraisal as comparing the costs, benefits and risks of alternative ways to meet government objectives. It does not itself decide those objectives or make policy. It asks practitioners to establish what would happen without the intervention, examine options and make the rationale for the preferred choice explicit.⁵

A hypothetical local programme illustrates why coordination can matter. Better access to an employment district may deliver less if residents lack the relevant skills; training may be less useful if people cannot reach the jobs. Considering both constraints can improve a programme’s logic. It does not justify counting the same employment gain twice or assuming that every connected project must be approved. Those remain questions for evidence and comparison with alternatives.

The guidance also requires attention to social value, public-sector financial effects, impacts on different groups and places, and benefits that cannot readily be monetised. This is why a large benefit-cost ratio alone is not a complete financing or delivery plan. A project can have broad social value and still need an explicit, affordable budget structure.

Delivery capability determines whether discretion becomes investment

Local choice is useful only if an authority can prepare credible proposals, procure effectively and oversee delivery. The Green Book calls for proportional appraisal, but proportional does not mean unsupported. It requires adjustments for optimism bias, including more realistic costs and delivery times and less optimistic benefits, and sensitivity testing of important assumptions.⁵

For a local investment programme, that translates into practical questions: what happens if construction takes longer, costs rise or expected use is lower? Who is responsible for resolving those problems? How will decision makers know whether the programme achieved its purpose rather than merely spent its allocation? The guidance says monitoring and evaluation should be planned before final approval, with their costs included.

The strongest case for devolution is therefore not that local decision makers can dispense with scrutiny. It is that better knowledge of local constraints can be combined with clear responsibility for financing and results. The forthcoming documents need to connect those elements: who can use the instruments, when they begin, how funding is distributed, what must be repaid and how performance will be assessed. Until then, the announced direction is clearer than the operating arrangements.

Source notes

1. 2026-10-24 · UK budget set to hand English mayors new borrowing powers, growth funding · Reuters / MarketScreener. ↩

2. 2026-10-23 · Budget Statement Wednesday 28 October · UK Parliament. Scheduled statement date. ↩

3. 2026-10-22 · PM puts communities first in government investment rules shake up · HM Treasury and Prime Minister’s Office. Crown copyright, reused under the Open Government Licence v3.0. Policy context, not confirmation of the Reuters amounts. ↩

4. Updated 2024-04-10 · Capital finance: guidance on minimum revenue provision (5th edition) · UK government. Crown copyright, Open Government Licence v3.0. Background on the existing framework, not final terms for the proposed facility. ↩

5. Updated 2026-02-05 · The Green Book (2026) · HM Treasury. Crown copyright, Open Government Licence v3.0. General appraisal principles; the October 22 announcement concerns further reform. Selection, adaptation and editorial analysis by Global Bole News. ↩ ↩²