Airfields to try are Tatenhill, nr Burton and Netherthorpe, nr Sheffield. Tatenhill is 20mins by road from Derby and Netherthorpe is about 45 mins by road. There is a group with an Auster, G-AJIT, in hangar 1 at Netherthorpe and at least one Aeronica group plus several Jodel groups there. There are always some shares for sale on the notice board in the main clubhouse at Netherthorpe. Share prices range from about £2500 to about £8000 (the latter for one of the fast tourers in the top hangar).
Can't remember what shares are on the board at present at Tatenhill but I think there were two group shares advertised there last weekend.