Hi willbank,
As others have said, it's your property to do with as you see fit(1). You could always go the opposite direction; encourage more visitors. The Bath area is very pleasant, and having another airstrip to visit is always nice; put up a shed with a kettle and some bikkies, charge a tenner and you'll be very popular
If entertaining is your thing (and your property can support it) then a fly-in B&B might also work, however beware, as someone mentioned, aviation is addictive
Yes, a big stretch from plough over to inviting strangers to visit, but generally us pilot types are very nice (despite what you might see on PPRuNe)
kib.
(1) As an aside; I wonder if it is possible that an existing leasehold agreement could force the airstrip to always exist? I'm not familiar with UK real estate law, so I'm probably talking c*ck.