If your neighbour is not susceptible to a polite request, and you plan
to sell up one day, I would think carefully before using legal
compulsion, even if it's available to you. There is a question in the
standard conveyancing enquiries about any neighbour disputes.
Something like this would come within that. You wouldn't honestly be
able to answer "no" to the question, and that might put some buyers
off. (However, others may be put off by a towering dense pine forest
on the boundary!)