This may help;
Ministry of Defence: Training New Pilots | National Audit OfficeNational Audit Office
the Department’s costing systems do not readily identify the costs of pilot training and the National Audit Office analysed the available data to show the indicative costs. They estimated the overall cost of initial pilot training in 1998-99 to be some £280 million, with operational training an additional cost. Fast jet training is the most expensive type of training. It costs some £3.8 million to train a fast jet pilot prior to operational training, with a further £1.9 million for the cost of an operational training course. The cost of training flying instructors was the largest single component making up 30 per cent of cost. Wastage among trainees, the need to fly more hours than planned, and delays in moving trainees through the system contributed 27 per cent of cost;
Etc etc, more info via the link.