I was being totally serious!!
Contact Battersea and quote CAA (CAP722c)
3.2 Airspace Access Charging
The establishment of an airspace restriction means that the sponsor is responsible for managing it, and not that the sponsor ‘owns’ it; airspace is a State asset. There should be no reason for a Sponsor to charge for access to airspace for UAS. Whilst some burden of work may exist in processing applications for UAS access to airspace, it is envisaged that this will not require an undue burden on the Sponsor and should incur negligible time or cost. Any such cost should not be passed on to UAS operators, or manned aviation operators - in the case of an airspace restriction which facilitates UAS flight by restricting manned aviation.
If they try to palm you off, contact the CAA 