thanks for all your replies
unfortunately I have already recieved a letter threatening legal action.
My husband went to talk with them and they just shouted him down!
They don't seem to understand we were upset when they removed the old fence and could have taken legal action against them ourselves - but didn't in the interest of neighbourly friendlyness
thats what you get for being nice
why should we have to put up a fence they took down just to put up 3 pieces of trellis!