Now, in an extraordinary volte-face, the Ministry of Defence says the "cats and flaps" planes may well be cheaper but it would be too expensive to redesign a carrier – more than £1bn – to accommodate them. The ministry is thus faced with the prospect of renegotiating a deal with the US, reverting to its original plan – namely buying the short take-off and vertical landing version of the aircraft, even though it is acknowledged to be less effective and more expensive .
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HMS Queen Elizabeth, the first carrier, will be mothballed immediately it is launched in 2016, according to existing plans. The second, HMS Prince of Wales, will be able to put to sea by 2020, but it is not known how many planes will be able to fly from it – nor what kind.