So, realisitcally, AvGas at £2 per litre (roughly) so £30 ph for fuel, maybe £40 if it's 100HP? Oil change probably 5 times a year (based on usage and an estimated 200-300 hours pa)? Cost of that probably, what, £50 max? Divide that over the 200 hours and that's £1.25 per hour (negligible). Even if we call it £5 an hour to be pessimistic, we've got £45ph. Hangarage at around £1200 per anum (i think, the guys who own it own the hangar too) and then insurance, circa £500 per year possibly, plus an annual (which admittedly, I have no idea of cost. So even on this, we're looking at not a great deal more than £60 per hour flying, wet? That seems great, or have I forgotten many things?