Thanks everybody for your help. The situation is complicated (as always) but I'll try to sum it up. I bought a field over 5 years ago, a field I knew well, it's situated between a road and a forest with a fence boundary. The owner of the forest has now advertised his land for sale with a 20' right of way for any purpose running right across my field. Evidently this is in the deeds of ownership. The land is unregistered so no sign of his claim showed up when I bought my field. In living memory there has been no access to the forest across my land other than a public footpath which is well marked, maintained and used. There is access higher up the hill via a trackway.A continuous fence, bank, scrub and trees form the boundary between my land and the forest. Livestock has been kept on my field for over 30 years, fenced in, i.e. no gate on the boundary. The vendor is marketing his forest for the commercial timber value so clearly the access for the purpose of logging is of benefit to him, and horror to me. We have nurtured a lowland meadow, with rare butterfly orchids and mixed deciduous woodland, I really don't want a road putting through it.