Funny old thing, but when the airport was in the doldrums, they very much liked having Luton Flight Training, as every take off, landing and touch and go counted as 'movements' for the airport's stats.
But as soon as they started getting busier with the arrival of EasyJet, they started to want to impose stupid rules (and fees) such as a club a/c had to depart before 1000h and could not return until after 1500h (or some such similarly restricting conditions). The right to send student pilots on solos from the aiport had been 'sold' to the airport years before, so it was all becoming a big pain in the ar*e. The club sort of devolved over to Henlow, and whether that operation continues I know not.