The aircraft carriers being built for the Royal Navy will be less useful, take longer to finish, and likely cost more than claimed, a parliamentary watchdog warns. The first, HMS Queen Elizabeth, will be mothballed immediately it is launched in 2016, according to the existing plan. However, the second, HMS Prince of Wales, is not now expected to be fully operational until 2031. Moreover, it will only be able to stay at sea for up to 200 days a year, significantly fewer than envisaged, says the Commons public accounts committee. The MPs' report, out on Tuesday, makes clear the quick...