Sounds like you were handled by Hangar 3 or J-Max?
The fees for landing are £8.60 + Vat per 500KG. (You get 50% discount for pre-booked training flights.) First 2 hours parking is free then £2.70 + Vat per 500KG per 24 hours or part of.
Avgas is £1.52 + Vat.