Hi, I live in a 1930's semi. Underneath our patio, there is a run of clay pipes which seem to be for run off water. They come across a neighbouring property but then I don't know where they run to as they can't be seen on the other neighbours property - get house us set further back. I don't imagine the pipes going under her house? Anyway...the clay pipes are blocked with silt etc. My patio floods when it rains hard. Does anyone know if the pipes are my responsibility or the water board? I've seen some info about ore-1937 houses but can't get to grips with it. I thought about lifting one of the loose pipes & jet washing but am afraid if might just block altogether further along. Can anyone advise? Thanks