Neighbour in semi detached joined house had a new garage roof, was a flat roof now it’s slanted, and since then we’ve had water coming into our garage. 2 roofers who’ve seen it said it’s because they don’t have lead flashing and it’s causing water to come in through the brickwork. What is the solution? Neighbours are very uncooperative, tried talking to them many times but to no avail. What is the next step? Money is tight for us so can’t really afford to fix their roof. Legally can we make them sort their roof out? Is there a way to prove that it’s causing water damage to our property?