I should have stressed that the less than £60 per hour includes the fixed costs eg permit, hangarage and insurance and it would actually be nearer £50 per hour if I wasn't forced to spend thousands of pounds replacing a perfectly serviceable 25kHz radio (recently) and a Mode C transponder (soon).
The marginal costs of oil/fuel (unleaded petrol) are only about £16 per hour and I rarely pay landing fees because I mainly land in fields. However, bear in mind that unleaded petrol in the UK is more like $6 per US gallon and 100LL Avgas can be more than $10 per US gallon.