We were without heating, hot water and unable to use the gas hob to cook. Our emergency call out provider could not get anyone out for a week and a half, others turned up and couldn't find the problem and even missed it. I rung John for help and in true ex-military engineer fashion came out the next day early, found the problem by following a safe, logical pattern and got our heating, hot water and cooker going again. We are so grateful for his work and he saved us a lot of money. He was honest and on time. My wife and I are very grateful to him and would highly recommend.