Capt Kremman
I would argue that Fairoaks is not under used in financal terms, there is at least one quite major maintenance company that does a considerable amount of work, one movement of a top end turboprop for maintenance generates far more economic benifit for the local community in terms of employment than a hundred movements by a microlight at Popham.
One could also say argue that the Fairoaks reprisents the best noise to financal benifit trade off for the local community.