Lyneham,
Adrian's right - at that time all British Concordes (002 & 01, the only UK ones built by then) would have been flying out of RAF Fairford. Around that time I remember our bit of BAC, Hurn, being treated to a fly-by of 01 in thanks for getting 01 & 02 flying. I beleive they beat up just about any base that had had anything to do with the programme up to then so that may be when you got your visit.