we have been using Gas appliance solutions for a few years now , kept an old boiler going at my partners house , on recommendation installed a new boiler at my parents house and after keeping a boiler limping along in our new house we made the decision to get a new boiler installed , the install and replacement rad valves was done in a day , wouldn’t have even known anybody had been in the house , i can’t recommend gas appliance solutions enough, we will be using them for years to come.