I am trying to think of which aircraft are left in RAF service that were there when I was serving..
When I joined up we had the Harrier, Jaguar, Tornado, Phantom, C130, Tristar, VC-10, Buccaneer, Tucano, Hawk, Dominie (HS125), BAE 146 (Queens Flight), Andover, Wessex, Sea King, Puma and Chinook. I think all that remains from that list is the Hawk and Chinook.
How could I forget the Canberra ? Yes, it was still in service, based at RAF Wyton IIRC. I believe they still used it for photographic reconnaissance but also there were some ELINT Canberras as well.
Just Spain and Italy using the Harrier now.. and they are transitioning to the F-35B.