Chancellor George Osborne has announced that the Ministry of Defence will have to find the funds to finance the replacement of the Trident nuclear deterrent.

The cost of renewing the sytem has been put at around £20 billion. In the past the Treasury would have been expected to foot the bill for this sort of expenditure.

The move appears to put him on a collision course with Defence Secretary Liam Fox, who has said that it will be 'very difficult;' for the MoD to maintain its other projects if it also has to pay for Trident.

Fox also stressed that with the possibility of Iran acquiring nuclear weapons, and the possibility of other states following suit, the UK needs to maintain its nuclear deterrent.