I flew their TB20 during my IR refresher and it is very nice indeed. Did Sheffield to Cambridge in 45mins!
Good instructor but book quick as he getting very busy as the FAA IR seems to be getting very popular IR to take by working guys so weekends are getting booked out! You may stand more chance if you have a midweek day off.
Enstone airfield is very nice as well although no instrument approach into it and its not that easy to spot in normal conditions.