UK unveils record 300 billion defence investment plan over four years

Outgoing UK Prime Minister Keir Starmer on Tuesday unveiled a record £300 billion defence investment plan over the next four years, marking the largest peacetime military spending commitment in British history as London seeks to modernise its armed forces amid rising global threats. The announcement, delivered in Starmer’s final major policy address before stepping down, includes an immediate £15 billion uplift to accelerate procurement of drones, autonomous systems and next-generation combat aircraft, with the total budget set to reach nearly $400 billion by 2029 .
The Defence Investment Plan prioritises rapid deployment of uncrewed aerial systems and maritime drones, drawing direct lessons from Russia’s war in Ukraine, where Kyiv’s drone-centric tactics have reshaped modern combat. The Ministry of Defence confirmed that over £5 billion will be allocated specifically to drones and autonomous platforms between 2026 and 2030, while the UK reaffirmed its commitment to the Global Combat Air Programme (GCAP), a sixth-generation fighter project developed in partnership with Italy and Japan .
Starmer framed the spending surge as essential to counter “a more dangerous and volatile world,” warning that Britain must prepare for potential high-intensity conflicts this decade. The plan also accelerates upgrades to nuclear deterrent infrastructure and expands the Royal Navy’s hybrid fleet concept, integrating smaller, agile vessels with advanced sensor networks. By 2029, defence spending is projected to reach £93 billion annually—equivalent to 4.2% of GDP—up from 2.3% in 2024, though critics argue the timeline for reaching NATO’s 3% GDP target remains unspecified .
Former Defence Secretary Ben Wallace criticised the plan as insufficient, stating that Britain still lags behind adversaries despite the historic outlay. Meanwhile, the funding will be partially offset by cuts to road and energy infrastructure projects, signalling a strategic reallocation of national resources .
The announcement comes as the UK prepares for a leadership transition, with Andy Burnham widely expected to succeed Starmer. Analysts suggest the defence plan may serve as Starmer’s enduring legacy, embedding a militarised deterrence posture that future governments will struggle to unwind.
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