The US military has been using Britain's atomic weapons factory to carry out research into its own nuclear warhead programme. US defence officials said that very valuable" warhead research has taken place at the Atomic Weapons Establishment at Aldermaston in Berkshire as part of an ongoing and secretive deal between the British and American governments. Campaign groups warned any such deal was in breach of international law. Kate Hudson, of Campaign for Nuclear Disarmament, said: "Any work preparing the way for new warheads cuts right across the UK's commitment to disarm, which it signed up to in the nuclear non-proliferation treaty. That this work may be contributing to both future US and British warheads is nothing short of scandalous." The extent of US involvement at Aldermaston came to light in an interview with John Harvey, policy and planning director at the US National Nuclear Security Administration. Harvey said: "There are some capabilities that the UK has that we don't have and that we borrow... that I believe we have been able to exploit [and] that's been very valuable to us." In the same interview, Harvey admitted that the US and UK had struck a new deal over the level of cooperation, including work on ... a new generation of nuclear warhead known as the Reliable Replacement Warhead (RRW).

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