The BAL flying club aircraft were "pushed out" by the airport shortly after EZY moved into H89..a lack of space was the given reason.
The aircraft moved to Cranfield and the club carried on there for a few years. After the merger with First Choice, the company withdrew any subsidies and the club became a private concern (Azure Flying Club) 1965 vintage PA28 G-ATHR is still with them but Mooney G-OBAL was sold a few years back..
Ref, the BAL BFS schedules....these were simply a way of increasing aircraft utilization at the time (usually the flights operated around the MOD Germany charters) This was never Thomson's core market.