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.