Seems most of the responders would have put it in a field and sorted out the fuel on the ground and I'd have to agree.
I don't know how far apart service stations are there in that part of Britain but looking for one of them would have been my plan. Land next to one walk over and buy some mo-gas (I assume you still can get super (leaded) fuel from bowsers or has that been withdrawn in the UK)
The R44 and R22 run well on mo-gas especially if you get in before you run low on the real juice and go for a mix of mo-gas and avgas. If you have just mo-gas it can run a little hot.
If you can't find a servo then farmers are usually pretty friendly and helpful. Well they are in this part of the world, anyway.