Harry updated our gravity system boiler with a new combi boiler as well as installing new radiators and replacing inefficient old radiators. He sent a detailed quote specifying all the work we had discussed (without omissions) and delivered on time and on budget. He was helpful throughout, helping us selecting the right size radiators and answered all our questions during that process. During the works, he was very contentious and mindful but had also great attention to detail. He called to let us know what time he'll arrive, was on time and cleaned at the end of each day. When we asked if he could move the location of the filter in the course of the overall installation, he moved it without any issue or questions (and suggested where else he could fit it). When issues were picked up, he arrived with solutions for us to decide on. And as agreed originally, he removed all the gravity system and arranged for it to be discarded - which was very helpful (nothing was left in the loft). When the work was completed, he showed us how to use the new thermostat and promptly issued all the paperwork (guarantee, etc...). We cannot fault his work. Harry was helpful, tidy, discreet and contentious and made the work fairly 'stress-less