The former head of Britain’s armed forces said the Royal Navy’s submarine fleet that carries the country’s nuclear deterrent is “beyond its sell-by date,” warning that a shortage of serviceable boats is forcing longer patrols, increasing wear and heightening safety risks.
Admiral Sir Tony Radakin made the remarks in his first public speech since stepping down as Chief of the Defence Staff after three years, telling the Institute for Government on Monday that successive governments had not matched words on the importance of the continuous-at-sea nuclear deterrent with investment and logistics to sustain it.
Radakin said shortages of serviceable submarines had led to unusually long patrols by Vanguard-class boats that carry Britain’s Trident warheads. The longest recorded patrol of a British “bomber” submarine is believed to be a 204‑day deployment in 2025, a mission that surpassed a previous 201‑day record set the year before. He said the submarines — designed for 25‑year service lives but now nearing 40 years in service — were showing physical signs of heavy use and that crews were bearing psychological strain from extended time at sea.
“Something is wrong when successive governments profess the nuclear continuously at sea deterrent is our highest priority but our sailors are having to put to sea for extraordinarily long patrols in some of the most complex machines on the planet that are beyond their original design life,” Radakin said.
The United Kingdom currently operates four Vanguard-class ballistic missile submarines. Radakin told the think tank that parts are increasingly being cannibalised from other boats to keep some submarines operational and that repair times had lengthened, compounding availability problems. He said conditions on return to port sometimes included hulls covered in slime and barnacles after prolonged periods at sea.
Each Vanguard-class boat carries a crew of roughly 130 sailors and officers. Radakin highlighted both the physical demands on ageing platforms and the psychological effects on those serving prolonged deployments, noting the operational and human consequences of stretching limited assets.
Beyond the immediate readiness and maintenance issues, Radakin used the speech to flag broader shifts in global military posture. He warned of a “third nuclear age” in which nuclear weapons and doctrines are increasingly present among more states, and he criticised the lack of arms‑control dialogue between major powers, specifically citing the absence of arrangements between the United States and China. He also pointed to the breakdown of long‑standing agreements following Russian violations.
Radakin referenced a range of global conflicts and tensions to illustrate the changing security landscape, including reported foreign fighters, clashes involving Iran and Israel, and Houthi attacks on international shipping. He also highlighted what he described as positive developments, including Ukraine’s resistance, NATO expansion, and closer European defence cooperation led by the United Kingdom and France. He said that, for now, Britain remained “safe” thanks to its deterrent, NATO membership and the US alliance.
Senior military figures often raise force structure and procurement concerns after leaving office; Radakin said he had repeatedly pressed ministers while in post about the state of the submarine fleet. His comments come amid long‑running debates in Westminster over defence spending, shipbuilding capacity and the timetable for the next generation of deterrent submarines.
Government officials have previously defended the continuous‑at‑sea posture and argued that replacement programmes and maintenance plans are in hand, but Radakin’s assessment underscores lingering challenges in sustaining that posture during a period of heightened international tension. The Royal Navy has not publicly disclosed operational patrol lengths for security reasons, but defence analysts and service statements have acknowledged extended deployments and maintenance pressures in recent years.
The issues Radakin described — ageing platforms, stretched crews, parts cannibalisation and extended repair timelines — raise questions for ministers overseeing procurement and shipyard capacity as Britain balances the costs of replacing a strategic deterrent with broader defence commitments. Radakin urged renewed attention to arms control as well as to the readiness and sustainability of Britain’s nuclear forces.
He left the post of Chief of the Defence Staff several weeks ago after a three‑year tenure that included overseeing British military support to Ukraine and managing rising tensions with Russia and other states. His public intervention is likely to add urgency to parliamentary and public debate over defence priorities and the timelines for renewing the submarine fleet.