Steve, you are really a glutton for punishment! Sure hope your wife never finds that information.
Why do you keep such meticulous records?
I try not to think about what I spend - and have certainly never budgeted a fixed amount for flying - but VERY roughly it works out like this each year (prices in Canadian dollars):
(1) glider club membership: $500;
(2) glider rental: $400;
(3) glider tows: approximately $250;
(4) airplane rental: 50 hours @ $90 = $4,500
(5) instruction: five hours @ $40 = $200
Total = C$5,850 (= approx. £2,350). Money well spent, I think. You only live once ...
If I average 20 hours of soaring pa, then that works out to a total of 70 hours each year, yielding an average hourly cost of about C$83 (= £34). But each year I also fly about 25 hours (for free) in our gliding club towplane, so that brings the hourly cost down to $65 (= £26). I can live with that.