My boiler service contract included an annual service. Service booked twice, and on both occasions 24 hours beforehand I was telephoned to say the engineer was sick. In the week prior to the appointments on both occasions I was telephoned with a list of additional equipment I could purchase and have installed 'to make my boiler safer' at the time of a service. I declined, and curiously the appointments were subsequently cancelled! This has all the hallmarks of a 'hard sell' scam. Avoid at all costs. The boiler was never serviced. I have terminated all dealings with 24/7.