I helped out at our local squadron for about five years as the chairman/secretary of the fund raising committee (referred to by Auster Fan). I had no instructional responsibilities but still tried to get involved as much as possible, including driving the minibus from time to time. Best thing I was able to do for them was to use my tanker connections to organise a couple of trips to Brize where about a dozen cadets were able to fly on a trip on a VC10 of 101 Squadron and see refuelling at close hand.
I'd just go down to the squadron on one of their nights and make yourself known to the CO - I'm sure he/she will be delighted.