When I was at Shawbury in the late '80s we often use to fly the new ATC studes (especially lumpy jumpers) and we also used to use 'Familiarisation flights' as currency for getting additional services out of flight safety, MT, etc.
eg If we needed additional survival packs for an exercise the CO would ask me to have a chat with IC Safety Flight at the Sgt's Mess bar, buy him a beer and get his new starters over to the squadron in time for morning prayers....