The nearest ILSs to North Weald that are likely to be able to help you are Cambridge, Luton, Southend and Cranfield. Can't help you with what the fees are though, you would need to give them a call. 01223 373535, 01582 395525, 01702 538420, 01234 758150 in that order.
If its quiet then possibly Stansted but I imagine that would be expensive.