Norman Dombey

The UK’s nuclear weapons capability is dependent on the US. Not only does Britain rent its Trident missiles from America, but the British-built warhead designed to be carried by those missiles, the Holbrook, is closely based on the American W76. The Los Alamos National Laboratory announced last year that a replacement for the W76 is going ahead: the W93 should be ready by 2034. There is no need for the UK to replace its warheads. A Holbrook’s maximum yield is ninety kilotons of TNT-equivalent, about six times the size of the bomb dropped on Hiroshima. But the US Navy wants a new warhead in the mid-2030s and the UK has to follow suit even though there are no good reasons to do so.

Britain’s ‘independent nuclear deterrent’ has been described by ministers as the basis of our defence strategy for nearly seventy years. Tony Blair proclaimed that ‘our independent nuclear deterrent has provided the ultimate assurance of our national security.’ We have used US missiles to carry our nuclear warheads but ministers of both main political parties have insisted that the nuclear weapon itself was British and designed at the Atomic Weapons Establishment (AWE) at Aldermaston. After all, we first exploded an A-bomb in 1952 and H-bombs in 1957-58 without help from the US or other state. Yet last year a defence minister hinted at the truth for the first time: Britain’s nuclear warheads are of American design.