New neighbour has moved in, all guns blazing. He claims that our extension encroaches over the boundary line by 2 inches. We have never had any inkling of this, certainly wasn't mentioned by our solicitor when we bought the house (extension was already there when we bought the house.) Im not sure why he has told us this or to what end but he mentioned legal action. Can he do anything?? DH is worried he can sue us or such like. TIA for any advice.