While some RAF Phantom and Buccaneer crews were carrier trained, they were few and far between and the bulk of the latter's aircraft were declared to SACEUR meaning operating from European Bases.
Whilst not debating your point, upon the declaration of a certain RA measure various RAF assets, including 43 Sqn, were transferred from SACEUR to SACLANT. Land based yes, but for maritime operations/defence.
I spent too many hours of my life transmitting aircraft out to the "gate" and transferring them to the MM - and then having them engaged by the force they were on their way to defend. And the number of fighters and tankers required to support a single maritime CAP over the fleet from a land base is really mind boggling.....