Beagle it is still put out to Tender, and Tayside Aviation have won that Tender in recent years. I did mine there in 1986 and are still meeting people regularly in the Aviation world who did theirs there too. Great intro to flying, and the Flying Instructors are assessed annually by CFS.
I think when the numbers shrunk several years ago it was cheaper and simpler to place the Tender at one airfield.
iRaven, I just don't think the RAF flying clubs would have enough flying instructors and aircraft to dedicate themselves to the courses which run into weeks duration and are done all year round.
SW