Of course they are not going to build aircraft-carriers with no aircraft to fly from them !! Assuming that the first one is ready in 4-5 years time, then it gives the Navy that much time to purchase,set up facilities for,and train the air & ground crews of,suitable "off the shelf" combat-ready aircraft.The primary requirements would then be ;

Trained pilots who can land on a conventional carrier.These would be trained (to fly the FA 18 Super Hornet )in the USA, where they could also receive DLP (deck landing practice) aboard US CVAs.Eventually,they would fly / deliver these aircraft to the UK.

A suitable airfield (RNAS Yeovilton) would have been set up to operate Hornets,with a Headquarters Squadron,a maintenance unit,engineering workshops,flight simulators,ordnance storage,etc etc & 101 other necessary facilities,including a Deck Landing Mirror for MADDL practice (Mirror Assisted Dummy Deck Landing ).

Other support,training, and trials facilities would be provided at Boscombe Down and possibly Farnborough.

Pilots would continue to undergo DLP and actually recover to / take off from US carriers in European / Mediterranean waters; by the time the first new carrier is ready,the aircrews should be pretty proficient !!

About 3 to 4 weeks ago,I have been led to believe, a senior Royal Navy ( possibly Royal Marine !) officer left for the USA in order to finalise the purchase of said FA 18 Super Hornets, at about $24 million each, a considerable saving on the JSF at £ 100 Million each !!! An attractive proposition for any cash-strapped government.

Of course, I could be wrong,but it makes good sense to me , and probably does to Mr Cameron & his advisors, but he wouldn't let US know,would he ?? Although it seems to be common knowledge in ---er --SOME circles !! And remember; if it's true,you didn't hear it from me !! Meanwhile ;
    I have serious doubts about the carriers' "Home Ports" ; "Eagle" and "Ark Royal", the navy's biggest ships ever ,at around 50,000tons and 800 feet long,were both based in Plymouth.The dry-dock in Portsmouth was much too small to take them.The only other dry-docks we could use were in Gibraltar & Singapore !!( I was in "Eagle" ).Therefore, I cannot see HMSQE or HMSPOW going to Portsmouth at their current length of 925 feet !! Yes,there IS a dry-dock at Rosyth,where they are being assembled,but ,once completed & fitted out,with their superstructures ,islands and radar antennae fitted, I can't see them getting under the Forth Bridge ---HMS Eagle and HMCS Bonaventure couldn't in 1968--I was there !! And I think even the Plymouth dry-dock would be a "tight fit", it always was !!

       We shall see !!