From ANO 2009, Section 1 Part 33 Page 6
'Direct costs' means the costs actually and necessarily incurred in connection with a flight without a view to profit but excluding any remuneration payable to the pilot for services as such;
I dont think this helps at all haha, wheras:-
'Annual costs' in relation to the operation of an aircraft means the best estimate reasonably practicable at the time of a particular flight for the year commencing on the first day of January preceding the date of the flight, of the costs of keeping and maintaining and the indirect costs of operating the aircraft, such costs in either case excluding direct costs and being those actually and necessarily incurred without a view to profit;
