Yes - all the previous contracts already let.
Tim Colton's website gives some details of these on the front page.
Maritime Business Strategies
$5.1Bn is £2.8Bn per ship at todays exchange rates. The actual value - totalling all the contracts noted above would be £4.5Bn per ship, or over double our current programme.
You would also have to factor in an awful lot of additional infrastructure work for a UK CVN, as only Devonport has a nuclear licence and a CVF/CVN won't fit in there.
The price of CVF is not as cheap as it perhaps could / should have been, but MoD bears a large proportion of the responsibility for that and it certainly ain't going to get much cheaper now.