I can remember Doves (GARBE was one of them) going from Dunsfold to Bitteswell then on to Brough (or possbly HoSM) for a short period; don't know when; normally they just did Dunsfold - Brough/HoSM and return.
I'm sure a new building was erected at Bitteswell on the northern end of the airfield separate from where the 'normal' Argosies/Victors were serviced in 3 x T2s which were south of the airfield across a road. They had a controller named Merril there who was ex Boscombe Down.
I drag raced at Bitteswell twice in 1985 after Doug bought the airfield and I'm sure I saw a building of some sort at the northern end of the runway where I turned off it after making a run but I only glanced at it briefly as I drove back round the eastern taxiway (which had a pronounced 'dip' and corner in it) to the paddock which was on one of the shorter runways; we used the main runway for actual racing.