Only if MoD factor in a Tardis so they can start construction a few years ago.
Realistically, the chances of MoD getting a carrier built, doing first of class trials and commissioned in 8 years is nothing but pie in the sky dreaming as they haven't even finished the design yet, let alone started cutting steel.
HMS Invincible is already gone, 1st of class will replace Illustrious IIRC.
Of course, Gordon the Brune may well cancel them yet.
I saw a clip on the news last night on the flight deck of HMS Illustrious. they were talking about the replacment which made me laugh. But when they are still talking about a due in service date of 2012 i actually fell of my chair.
5 years o really!!!!