This fleet you proposed is a really nice idea which could work.
I thought RN aircraft Carriers as follows: (I am aware about the history of British aircraft carriers)
-Colossus Class: Like real world, scrapped or sold until early 1960's.
-2 Majestic Class were modified to anti-submarine warfare carriers with Gannet/Sea King. 3 were sold to Canada, India, Australia (one each).
-Centaur Class cancelled completely
-3 Audacious Class built (3, as originally planned)-Third ship of the class sold in India in 1978 and became INS Viraat. Viraat is still active, while RN ones scrapped in late 1980's.
-When the CVA-01 cancelled, RN naval architects proposed an smaller aircraft carrier based on old Malta class with Type 42 destroyer electronics and Sea Dart missiles. The Sea Dart tested like US way-take a surviving WW2 ship large enough, put the GMLS and radars on it and test them. In RN case, the "lucky" ship was HMS Sheffield (C24), which scrapped after testing of Sea Dart completed.
-These aircraft carriers approved and built in late 1960's to early 1970's, named Queen Elizabeth and Queen Victoria ("Queen Class aircraft Carrier").
-The Invisible Class replaced the old Majestic Class in ASW role officially. The third ship of class built for Australia with different electronics and without Sea Dart. Later the Ocean Class was built as helicopter carrier and Invisible Class became Harrier Carriers.
-This aircraft carrier (
http://www.shipbucket.com/images.php?di ... eracao.png) replaced the Queen Class in my scenario. Of course with British electronics and systems, even propulsion)
-So today my Britain has 4 carriers, Invisible Class and the above.