Hi Steve,
If it were me I'd be interested to see if he would sell it, I'd love to own 10 acres of woodland!
However, given that it appears there is no competition for use of the land and its of little use to anyone else anyway .... and you have good access .... I would be more than happy to pay £200 PA or a bit more if necessary. I imagine it will stand up to the weather well and not turn into a bud bath readily.
If I could make use of any timber for a woodburner then its even more attractive.
Pete