David Bessant
This all comes down to your budget, a fence is the cheap way to go or a more of a job would be to deconstruct clean stones and rebuild around tree and then also get tree cut back rather than take down,although if it's a tree outside your boundary then you need to contact the council or very high fines are put in place if you do cut a tree back belonging to the highways . But put an add out asking for a general builder and check his references on rated ,get two or three quotes , good luck.