We used Mark Thompson and his team members Greg and Sam for the second time after being impressed with their diligence, reliability and high quality work the first time around (emergency boiler replacement close to Christmas 2019). We needed a whole system replacement in a rambling old house - no small feat in terms of time, money or disruption - and would not have trusted anyone else to do it. The main factor in recommending them is the high level of skill, experience and insight displayed by Mark and his team, but other factors include their courteous, friendly attitude, tidiness, clarity of explanations and general air of conscientious hard work. They were careful to leave us with water and usable spaces over nights, and clear about when there would be noise or unusable rooms, so we could plan around it. The job took three weeks so these small factors became very important, particularly when working from home. Mark, Greg and Sam completed this huge job a day early, achieving a tidy, timely, top quality result, with a much improved heating and hot water system, in a complex, non-standard working environment. They were never late or messy, unfailingly kind and polite even after long, dusty days, utterly trustworthy, and most importantly they are top flight heating engineers. Can't recommend them highly enough.