Hi Mobes, I see that you have a problem in regards to getting Sky, becuase of a tree.
I had this problem, but l spoke to Sky and an engineer came out, he had a look, and he said there was not a problem, if the dish is on the side of the property, they can move it, or even place it on the roof, providing the tree isn't a big elf like about 40 feet high, they can get round it.
I have had Sky for about 10 years now, and the tree is still there.