The UK government’s Dreadnought submarine investment of £8.4 billion marks the formal start of what the Ministry of Defence calls Delivery Phase 4 (DP4), with the bulk of the money, £5.9 billion, going to BAE Systems under a contract that will carry two submarines all the way through to sea trials.
Prime Minister Andy Burnham visited the BAE Systems shipyard in Barrow-in-Furness on Thursday alongside Defence Secretary Wes Streeting. The optics were deliberate. Barrow hosts 13,500 of the programme’s current 47,000 jobs, the largest concentration of any site in the country, and Burnham’s pitch rests on the idea that defence spending and levelling-up are the same argument.
What the Dreadnought submarine investment actually covers
The DP4 contract is more specific than the headline figure suggests. According to the Royal Navy, the funding will complete HMS Dreadnought, including her sea trials, take second-in-class HMS Valiant through to sea trials, and continue construction of HMS Warspite and King George VI. The keel of HMS Dreadnought was laid in March 2025, so this is not a programme that exists only on paper.
The £8.4bn sits inside a larger envelope. The Defence Investment Plan, published in the final days of Sir Keir Starmer’s government, commits £63.6 billion over four years to the Defence Nuclear Enterprise (DNE). Of that, £47 billion covers keeping existing submarines operational, progressing the Dreadnoughts, beginning early work on whatever might replace them in three decades, and upgrading naval docks and manufacturing facilities. The DNE’s share of the MOD’s overall budget across FY26/27 to FY29/30 is estimated at between 20% and 25%, representing more than £20 billion above what was spent on the DNE in the previous equivalent period.
That context matters. Reform UK’s Danny Kruger called Thursday’s announcement a ‘rehashed spending plan’, but the DP4 contract structure is a genuine new commitment. The spending was planned; the contract with BAE Systems giving it legal and commercial form is the news.
The economic geography is the political argument
Burnham’s framing is worth taking seriously, even if the politics are transparent. The DNE supply chain runs through over 6,000 UK companies, according to the government’s own figures. Alongside Barrow’s 13,500 roles, the programme supports 9,000 jobs at Aldermaston and Burghfield, 8,000 at HMNB Devonport in Plymouth, 5,000 at HMNB Clyde, 4,000 in Derby, 2,500 in Bristol, and smaller concentrations in Rosyth, Sheffield and Thurso. The government projects the overall jobs figure rising from 47,000 today to 65,000 by 2030, including 22,000 apprenticeships by 2035.
There is a wage dimension too. A UK government nuclear growth document puts the DNE wage premium at approximately 20% above comparable roles. For Barrow, a town whose industrial base largely collapsed in the 1990s, that is not a marginal difference.
BAE Systems has also posted a 40% increase in productivity at the Barrow yard over the last three years, with approximately 1,800 additional roles created there under the current government. BAE Chief Executive Charles Woodburn said: ‘The Dreadnought programme is of vital strategic importance to the UK, underpinning the security of our nation and our allies for decades to come.’
Conservative shadow defence secretary James Cartlidge welcomed progress on the programme but accused Burnham of ‘failing to commit’ to fully funding defence. It is a fair charge to hold open. Burnham has stated he wants to meet a Nato target of spending 3.5% of national income on defence by 2035, but neither he nor Chancellor John Healey has yet set out where the additional money comes from.
The Liberal Democrats called for defence bonds to raise dedicated funding. The Greens questioned spending billions on ‘weapons that must never be used’. My read is that the deterrent debate is largely settled in Westminster; the argument that will run is whether the procurement and supply-chain ambitions survive contact with Treasury constraints.
The Vanguard-class submarines the Dreadnoughts will replace have been in service since 1992 and are due to retire in the 2030s. If the schedule slips, there is no fallback. That is the real deadline driving this spending, and it concentrates minds rather more effectively than any political announcement.
