The landing and parking fees are extremely reasonable.
http://www.egcn.co.uk/Index_files/Charges2006.pdf
GA charges are in Schedule 'G'.
The flies in the ointment are that there is a minimum invoice value of £25.00 and that handling is compulsory.
Handling is with Signature who are unlikely to be cheap.
There may be the option of getting handled by a flying school on the airfield (there in in some places - Jersey comes to mind). If that's allowed, it would be cheaper for you.