Drones Over Dreadnoughts: Is Britain's Bet on Autonomy Modernisation or Austerity?

On 15th October, Defence Secretary Wes Streeting stood at the Center for Strategic and International Studies in Washington and gave a set of numbers that now articulates British defence thinking. A drone costing about $650 can destroy a $4 million tank, he emphasised, and an uncrewed boat worth $250,000 can sink a $65 million warship.¹ The same day, the Ministry of Defence asked the wider industry for ideas on the Type 93, a robot submarine around 12 metres in length, intended to guard home waters and undersea cables.² Last month, the Royal Navy led the anti-submarine trials at a NATO exercise off the Portuguese coast, where underwater gliders, uncrewed boats and sonobuoy-dropping drones hunted submarines together.³

This message outlines that Britain is betting on autonomy. In June it cancelled the Type 83, the destroyer meant to replace its six Type 45s, in favour of at least six ‘Common Combat Vessels’ that will act as a ‘control hub’ for uncrewed systems.⁴ Yet this plan that made that choice arrived years after the last credible one, in the words of Parliament’s spending watchdog,⁵ only once Defence Secretary at the time, John Healey, resigned warning it “could make the country less safe”.⁶ Healey is now chancellor under Prime Minister Andy Burnham, and his first budget on the 28th October will not set a date for the 3% of GDP target he once fought for.⁷

So, is the drone bet a real modernisation of how Britain deals with conflict, or a way of manipulating a tight budget to look like an autonomous strategy? This article will touch on both sides of the debate. The direction is right, but the money behind it is thin, inherently making the gamble far more fragile.

What Has Britain Actually Bought?

The Defence Investment Plan (DIP), published on 30th June, commits £298bn to defence over the next four years, with the annual budget reaching just under £80bn by 2029.⁸ This totals roughly £15bn more than the previous plans.⁹ Within it, the MoD promises “over £5bn into autonomous systems over the next four years”.¹⁰

That sounds like a substantial amount until it is set against the whole. £5bn is roughly 1.7% of the four-year total. Janes’ breakdown shows the defence Nuclear Enterprise taking £63.6bn, including £47bn for submarines against an £18bn for the entire naval budget.⁸ Britain is not choosing ‘Drones over Dreadnoughts’ in the literal sense: the nuclear enterprise, which pays for Dreadnought-class submarines, remains the single largest commitment within the UK Defence Budget, and the submarine budget alone is about nine times the money for autonomy. Even the plan’s own figures for the hybrid fleet do not harmonise, giving £1.5bn in one place and “at least £1.3bn” in another.¹⁰

However, there have been changes in the shape of the surface fleet. Alongside eight Type 26 and five Type 31 frigates, the navy plans a family of uncrewed ships, the Types 91-94, with first Common Combat Vessels arriving from the early 2030s.⁴ Navy Lookout estimates up to 30 large uncrewed surface vessels could eventually sail with the escort force.¹¹ This follows in line with the 2025 Strategic Defence Review, which promised a “New Hybrid Navy”, a new Drone Centre and “doubling investment in autonomous systems this Parliament”.¹² This same review promised a “10x more lethal British Army” built on AI and land drones.¹² Certainly, the modernisation shift is real, but it is smaller in monetary backing than in rhetoric.

The Modernisation Case

Evidently, the strongest argument for the British bet on autonomy stems from Ukraine. Streeting pointed out that British small firms took one-way attack drones from paper to flight in three months, with systems reaching the front-line in Ukraine within a year, a pace no traditional programme has matched.¹ Cheap, numerous systems that can be lost without losing sailors changes both the arithmetic and morality of war, and a country that ignores them risks building a technologically autonomous fleet for the final conflict.

The Navy leadership agrees. In April, First Sea Lord General Sir Gwyn Jenkins told RUSI that “we must end the mentality that what we need is ever more expensive and larger platforms”, pointing out that Russian incursions into UK waters had risen by a third in two years.¹³ His response is uncrewed escorts sailing with warships within two years and drones patrolling the North Atlantic under the Atlantic Bastion programme.¹⁴

Most persuasive of all is that the old model is already failing. When HMS Dragon returned to Portsmouth on 9th October, no replacement was announced, leaving a single support ship as Britain’s only naval presence near the Strait of Hormuz. Only one of the six destroyers, HMS Dauntless, is at high readiness.¹⁵ A navy built on a handful of attractive ships cannot be in enough places at once. This same logic can be applied, where ‘loyal wingman’ drones such as BAE’s Brontanax, unveiled at Farnborough in July, are designed to cost about a third as much as a crewed fighter.¹⁶ In regard to this perspective, autonomy is not a cut but a way of getting mass back.

Is Autonomy Covering for Cuts?

The opposing case initiates with money. Defence officials asked for about £28bn over four years and received around £15bn.⁶ General Sir Richard Barrons, a co-author of the 2025 review, wrote after Healey’s resignation that the shortfall was “not ultimately a question of affordability. It is a question of choice”.¹⁷

Furthermore, independent analysis supports the sceptics. The IFS found that the extra funding averages £3.8bn a year, but about a third of it, roughly £1.2bn, had no traceable source, and about half came from cutting other departments’ capital budgets. Reaching NATO’s 3.5% target by 2035 would need around £25bn a year more than announced, however the current plans get “just over a third of the way”.¹⁸ Even the headline share of GDP is disputed. The government cites 2.7% by 2029-30, but Janes calculates that core military spending only rises from about 2.2% to just under 2.3% with the rest established by wider security and intelligence spending.⁸ Healey now argues that Britain needs to be cautious with fiscal discipline, stating “we simply can’t deal with the problems we face as a country by maxing out the country’s credit card”.⁷

This matters due to the fact that the drone fleet arrives in the years the plan leaves empty. The DIP admits that spending from 2030-35 is largely unallocated, yet that is exactly when the first Common Combat Vessels and their uncrewed partners are due to be established. Meanwhile, the Type 45s start retiring from 2035.¹⁰ Navy Lookout warns that they are Britain’s only sovereign naval ballistic missile defence and that the plan leaves no direct successor. They also point out that uncrewed ships still need maintenance, software and logistics, that missiles cost the same whatever fires them, and that the hybrid fleet may end up costing almost six Type 83s.¹¹

Additionally, there are technical risks too. Engineers from QinetiQ warned in April that “communications failure is always possible” and that operators cannot be adamant of positive control at all times, proposing legal questions about whether protecting an uncrewed vessel counts as self-defence.¹⁹ The nuclear budget continues to grow, taking £10.9bn, or 18% of defence spending between 2024-25 and is closing on 25%, ultimately squeezing everything else.⁵ Thus, the fear is not that drones are wrong but that they become the reason for a smaller navy and military force in general.

The Verdict

The modernisers are right about the direction of autonomous military investment. Ukraine has demonstrated what cheap, numerous systems can achieve, the Navy leadership has embraced them, and a fleet that can only keep one destroyer at high readiness is proof that the old model is coming to an end. Cancelling the Type 83 was a defensible choice, and most certainly not a reckless one.

However, as previously mentioned, the sceptics are right about the monetary aspect. A transformative policy worth about 1.7% of the budget, resting on years with no allocated spending and a funding gap the Treasury is yet to solve, is a hedge rather than a revolution. Britain has swapped a destroyer it could not afford for a pledge it has not yet found funding for. The risk is that the autonomous movement arrives late and in few, after the crewed ships they were meant to support have already gone.

So, the accurate verdict is that this is modernisation, restrained by an austerity budget. Whether it becomes real modernisation depends on two upcoming decisions: whether Healey’s Budget on 28th October closes the £1.2bn annual gap, and whether the next spending review sets a date for 3% and redirects funding towards the 2030s fleet. If both occur, drones and autonomous technology will add to the British sea power. If not, they will act as a cover story for a smaller naval presence. The honest summary of Britain’s autonomous gamble is that it is a strong and modernist idea, waiting for the budget to support it.

Footnotes

1. GOV.UK, Defence Secretary Wes Streeting Speech at the Center for Strategic and International Studies (opens in a new tab), 15th October 2026. ²

2. The Register, Royal Navy goes fishing for suppliers to build its Type 93 robot submarine (opens in a new tab), 15th October 2026.

3. Royal Navy, Uncrewed and autonomous technology tested against underwater threats in NATO exercise (opens in a new tab), 1st October 2026.

4. Naval Technology, UK MoD axes Type 83 in favour of new 'hybrid' warship fleet (opens in a new tab), 29th June 2026. ²

5. House of Commons Public Accounts Committee, Drift at the MoD: Defence plan delays undermine UK credibility with allies and industry (opens in a new tab), 7th June 2026. ²

6. The National, Defence Secretary John Healey resigns over investment plan which makes UK 'less safe' (opens in a new tab), 11th June 2026. ²

7. The Guardian (via AOL), John Healey to duck meeting UK defence spending target in budget (opens in a new tab), 28th August 2026. ²

8. Janes, UK DIP 2026: Government changes Royal Navy, funds sovereign munitions and strike capacity (opens in a new tab), 3rd July 2026. ^{2 3}

9. Al Jazeera, UK's Starmer announces 300-billion-pound defence investment plan (opens in a new tab), 30th June 2026.

10. Ministry of Defence, The Defence Investment Plan: Equipping our forces, defending our future (opens in a new tab), 30th June 2026. ^{2 3}

11. Navy Lookout, All in on the hybrid navy – the Royal Navy's surface fleet gamble (opens in a new tab), 29th June 2026. ²

12. Ministry of Defence, The Strategic Defence Review 2025: two-pager (opens in a new tab), 2nd June 2025. ²

13. GOV.UK, First Sea Lord Speech at RUSI (opens in a new tab), 29th April 2026.

14. RUSI, Advances Towards a Hybrid Royal Navy: First Sea Lord Speaks at RUSI (opens in a new tab), 29th April 2026.

15. USNI News, U.K. Royal Navy Destroyer Returns Home From Middle East, Strait of Hormuz Multinational Mission in Limbo (opens in a new tab), 12th October 2026.

16. The Independent (via AOL), Wes Streeting unveils 'loyal wingman' drones in 'groundbreaking moment' for defence (opens in a new tab), 22nd July 2026.

17. Chatham House, John Healey's resignation highlights profound strategic failure in the UK government's approach to defence (opens in a new tab), 11th June 2026.

18. Institute for Fiscal Studies, Initial response to the Defence Investment Plan (opens in a new tab), 30th June 2026.

19. UK Defence Journal, Hybrid ASW push raises command, comms and legal challenges (opens in a new tab), 16th April 2026.