it will depend on where the boundary lies. if its your fence on his land, he could take it down. If its your fence on your land he cannot touch it. What would be wholly more sensible would be to reach a compromise, sit down and talk to him. You say it's for financial gain, but unless the land registry plans are extaordinarily vague, surely it wouldn't amount to much more than a foot or two? he is hardly going to get loads of money for such a small bit of extra land. Anywy, is there a compromise somewhere? (ie he wants 10 inches, you agree on 5?