Alec whose name we found on the Valiant list of heating engineers, was called in to put an end to a major hassle we have had with the heating system we’d inherited when we bought our house in December 2016. The radiators were noisy and erratic, the ( only 3 year old) boiler made frightening booming noises and the system needed to be re pressurized regularly as it kept shutting down. It drove us to distraction. Every time the system shut down we ended up with a cold house and no hot water. Alec and his colleague Marco used the German system he is a fan of diagnosed and solved the problem. They were punctual, efficient and highly professional. As Alec promised we no longer think about the heating system and he promised us also that after the year long warrantee expires (which he kindly offered to start start from the winter since our house is being refurbished now) all we will need is an annual service which he will perform at a reasonable fee. We highly recommend his services.