Skypartners,
It is very easy to compare your prices with the likes of Leeds, Newcastle and Bournemouth as they (along with EGGD) are some of the most expensive and anti GA airports in the country...
On the other hand compare your prices to the likes of:
EGJJ, ILS, Radar, LDG Fees £12.00 free parking for a up to week
EGTE, ILS, Radar, LDG Fees similar to yours Parking £65.00 month
and I could go on...
I agree you have excellent facilities but personally I find £270.00 a month for parking unbelievably high.