Recently had boiler serviced and then a warning light came on the display panel, checked in manual and it said call engineer. Mike arrived and upon being given my explanation of the fault he quickly diagnosed a battery failure in the programming unit, I could have replaced myself had I known. Mike was extremely professional and took the time to explain how to rectify should this happen again. His attention to detail and product knowledge is second to none. A very pleasant experience from booking the service call, email to confirm visit and the home visit. Would highly recommend.