Neighbours tree and my building work

[sallydontlivehere]

I don't have great relations with my neighbours - we don't have anything to do with each other, but since I mentioned I was building an extension on the back on my house (we are semi-detached) they have been pretty hostile to me as they obviously don't want me to build it.
They objected in planning, but it has gone through

If they had planned to get the tree cut down before maybe they won’t be too bothered. Have you spoken to them about the tree?