When there is heavy rain I have water dripping through my ceiling in one place above my stairs. As far as i'm aware there are no pipes in that part of the loft, and it only happens when it rains. Unfortunately due to the location of the leak I cannot see anything in the loft. I have looked at the roof from the ground and it appears there a few tiles near the top that are not laying as they should but I cannot confirm this. Is it likely to be roof tiles causing it and should I look for a roofer to check it out?