Don't know if you still can but I took an tour of Culdrose (go to the visitors centre/ view area with ID) which consisted of being taken round on a bus.
The highlight was the deck handling school where there are a number of Harriers. We were allowed to get off the bus and get very close to the beasts, but not go in the hangar.
The other highlight was the Hawk maintenance hangar which we were allowed to walk round and have a look in a cockpit.