Finningley Boy and Si -
I highly doubt that the local Army commander (who will be typically a Lt Col, rarely a Col) makes the decision as to where buildings go or don't go. He has an input, sure, but it is not his train set. He only gets to play with it.
The owner is Defence Estates. The Army may well put a request in to DE requesting new blocks in say, Marne Barracks, but it will not be the CO that decides where they go. DE will make the determination of where the blocks go, and the use of the land. It's a little disingenuous to blame the demise of an airfield on the Army. If it is in the wider Defence interest to move a lodger unit (say a VGS) 10 miles down the road, then that decision is made and promulgated. But it's not the CO of Marne Bks making it.
If the RAF need to retain the airfields in Scotland, then that will be one of the considerations in the alterations to the existing buildings to accommodate the new users.