Downing Street is weighing a faster route to spending 3% of GDP on defence before this Parliament ends in 2029, after Sir Keir Starmer used the Munich Security Conference on 14 February to argue the UK must “build our hard power… the currency of the age”. Officials are exploring options but say no decisions have been taken. (nz.news.yahoo.com)

For now, the published path is to reach 2.5% of GDP on NATO‑qualifying defence from April 2027, with the headline rising to 2.6% once the activities of MI5, MI6 and GCHQ are brought under the definition. That uplift is underpinned by a cut to UK aid to 0.3% of GNI from 2027, according to the House of Commons Library and Treasury documents. (commonslibrary.parliament.uk)

Accelerating to 3% has a clear price tag. The Office for Budget Responsibility’s March 2025 forecast put the additional annual cost at £17.3bn in 2029–30; the Institute for Fiscal Studies’ Bee Boileau told the BBC that once already‑planned increases are netted off, the figure could be closer to £13–14bn. (commonslibrary.parliament.uk)

That push runs up against the government’s fiscal rules: balance the current budget and have net financial debt falling by 2029/30. Chancellor Rachel Reeves has also signalled that within this Parliament defence and intelligence spending will not exceed 2.6% of GDP, underlining Treasury caution about borrowing to go further without offsets. (instituteforgovernment.org.uk)

The international context has shifted as well. At The Hague summit in June 2025, NATO adopted a 5% defence investment commitment for 2035, with at least 3.5% reserved for core defence and up to 1.5% for resilience and civil preparedness. The OBR estimates meeting the 3.5% core‑defence benchmark by 2035 would require roughly £38.6bn more a year. (nato.int)

Capability pressures are already visible. In January, Chief of the Defence Staff Air Chief Marshal Sir Richard Knighton told MPs “we can’t do everything we would want to do, as quickly as we would want to do it, within the context of the budget we’ve set,” as ministers finalise a long‑delayed Defence Investment Plan. Reporting last week pointed to a four‑year MoD funding shortfall of around £28bn. (itv.com)

How to fund any earlier move is the live question. BBC reporting suggests options floated in Whitehall include deeper reallocations – aid, net‑zero programmes, and unspent transport capital – or limited extra borrowing. The Treasury denies resisting a specific “3% plan” and says conversations are cross‑government. Markets will watch whether any package preserves headroom against the rules. (nz.news.yahoo.com)

For industry, timing matters as much as totals. Pulling forward to 3% could accelerate orders across munitions, shipbuilding and propulsion, but execution capacity still lags. BAE’s expanded explosives facility at Glascoed, intended to lift 155mm shell output, remains in testing after mid‑2025 delays – a reminder that spend must translate into throughput. (theguardian.com)

By way of baseline, NATO estimates put UK defence spending at about 2.3% of GDP in 2024 – roughly £64–65bn – even before the 2027 uplift. The Commons Library calculates that moving to 2.5% implies around £6.4bn more per year versus a 2.3% counterfactual. (commonslibrary.parliament.uk)

Politics will shape the timetable. After the resignation of chief of staff Morgan McSweeney on 8 February, some insiders suggest the internal dynamic around big‑ticket choices has shifted, though decisions ultimately sit with No 10 and the Treasury. Parliament’s Public Accounts Committee has opened an inquiry into the affordability of the Defence Investment Plan – expect numbers investors can model against as evidence lands in the coming weeks. (theguardian.com)