When I started having problems with my heating, I called in a heating engineer. He had a very good look at the system and said that my boiler was working fine, it was the drainage pipes which were the problem. He recommended calling a plumber, so I went online and did a search for “drainage blockages London“. I managed to find a guy who could come out straight away, which was a relief as my home was very cold by this time! He did a brilliant job sorting the drain out and didn’t charge too much either.