Pay for Grob to finish developing/certifying the G140TP. Buy one for use as personal aircraft.
Buy small to medium hangar (with attached flight planning & met area/bar/clubhouse etc).
Also buy - EA300LP, PA-18 Supercub, DA-42, Cessna Caravan & possibly a biplane of some sort. Oh and of course a Spitfire
Crack on with lots of ratings/experience, and aim to run said hangar as flying club. Would try to operate as "members pay running costs only" but really have no idea if that would create more problems (due to possibly undercutting other clubs, lots of wannabe members etc) than it would solve!