It will take more than 4 pilots to run an aircraft 7 days a week, it would take four pilots (2 people in each crew, 1 crew for the morning, one for the afternoon) flying each day and they can probably only work 5 days a week, then there is standby cover in case of sickness, then training and annual leave. Probably 8-10 pilots per aircraft. Say 8 at average £45k salary = £360k annually or £1000 per day, if each aircraft does 10 flights a day then the crew for each flight costs about £100, or each or £8.33 per passenger.
Just guesses, but I think closer to reality than £5.
Aircraft cost 7m euros @ 8% interest = 560,000 euros per year plus depreciation of 10% makes 700,000 per year. So interest and depreciation 1,260,000 euros per year convert to £ =1, 070,000 divided by 365 = £2931 per day, or £293 per flight, or £8.42 per passenger.
Your fuel cost looks very low.
Ticket office costs: No idea
Travel agent costs?
Booking system costs?
Compensation and hotels etc during fog?
Airline overheads
Navigation costs
More cost info here
http://compair.aviationresearch.com/...&document_id=3