Despite having our boiler replaced by British Gas several years ago, our central heating system was getting progressively worse, and although British Gas service our system every year, they never really did much about it sorting out the problem. So we contacted House Doctors and David agreed to power flush our system. David was very knowledgeable and gave us lots of advice, and although our system was extremely clogged up (one of the worst David had seen) our central heating is now so much better. Some of our radiators hadn’t been warm for years, and now they are all performing well! We would have no hesitation in recommending David and House Doctors!