Go to this link -
http://www.aso.com/i.aso3/staticcont...ain&iaso3sid=1.
You'll find reports for DOC's, Fixed costs, Annual budget, Performance and Specs. These are largely US based prices, but will give you an indication for approx $50 per aircraft report which includes the 5 headings mentioned above.
They are useful for an initial overview but would probably never replace accurate operator costs in UK (I'm assuming).