Hmm, I think I might have misunderstood the term ancillary services, but what I meant was any on-site operator paying the airport rent:
Cobham Aviation Services / Cobham Flight Inspection
Durham Tees Flight Training
Great North Air Ambulance
Police Air Unit
Private Aircraft Owners Group
Serco
Sycamore Aviation
TNT Express
Weston Aviation
Cobham and Serco are two powerhouses as big if not bigger than Peel, if Peel did try to close the airport, they along with the other above mentioned companies, would soon stop them.