Posted: 04/07/2014 at 21:38
Talk to your sons neighbours. I had to stop a new neighbour from "trimming" the oak tree as he objected to the acorns falling. It has a preservation order on it. If you dont like oak trees don't buy a house with a 150 year old oak on the boundary.
If the tree has a preservation order on you cannot do anything that will damage or harm the tree, and that includes trimming the roots.
Some trees such as plums, will send up suckers if you damage the roots. you may have a bigger problem then.