I had PA Carruthers Ltd in to change my ancient Oil Boiler central heating system over to Air Source. Time was spent before the changeover explaining how the system works, what would need to be done (including alterations required), time scales and costs. Alterations were discussed, costed and agreed beforehand. Work started on the given day and has finished on time, too. The overall impression of having the work done by PA Carruthers Ltd is that they are very efficient and knowledgeable. Each person knew exactly what they were doing and got on with the task at hand. Ongoing questions were answered immediately, and they were all extremely helpful and obliging. The system was set up, and operating instructions given verbally along with the printed manual. I will get another visit in a couple of days to check if I have any questions and telephone backup is ongoing, should I need it. A fantastic, professional service that I would Highly Recommend.