I would like to endorse this recommendation. Dave was recommended by a plumber I found here. We have had a rather unpleasant problem caused by a blocked external drain. It took several days to fix and therefore cost more than I initially had hoped, but I am now confident that we should be fine. He arrives on time, works hard and fortunately has a great sense of humour, which for our job was necessary. I wish I had used this forum earlier! Andrew