Up until 1994, the Northernmost Nato Command was AFNorth at Kolsas (Oslo). The CinC was always a Brit, with a German deputy and the Andover was at the CinC's disposal.
I believe the Andover was hangared at Gardemoen, and indeed when we broke down there in a Canberra T17 in the winter of 83 or thereabouts we made use of the same hangar.