I had appliance guys over to re-do my dryer vent and they were in and out got the problem solved quickly and very clean! We install boilers all across the uk. We also work with estate agents like savills so give yourself peace of mind before you put down that deposit! To make sure everything's running smoothly before the winter months, your annual service will usually take place between april and september. Printed curcuit board for boiler's with serial number below btg box opened.