azeman, there's a lot of factors to consider, and like a car, maintenance can vary wildly year on year, so it's hard to give accurate figures without giving specific aircraft examples, locations, frequency of flying etc.
Simple/short answer, for something like a 1980s single engine Cessna, a few hundred pounds per hour will cover all costs based on 100 hours per year.
You also need to have a lot of money on hand, engine overhauls for example can cost a lot of £££.
Last edited by gordonquinn; 5th Mar 2013 at 10:45.