The owner of Filching Manor Motor Museum was Paul Foulkes-Halbard, about whom I know nothing other than this from a local newspaper report of his death in 2003:
After a little more digging in my lunch hour it seems as if the Museum is no longer open to the public (?) but that the kart track, the Campbell Circuit, is open for corporate events.Mr Foulkes-Halbard was also a well-known figure in the car world, and belonged to the Bentley Drivers' Club, as well as being a member of the Bugatti Owners' Club...
Does anyone know more about Paul Foulkes-Halbard or his museum?