After waiting 3 weeks for an engineer appointment. He came & all he wanted to do was quote me for a power flush as 3 out of 10 radiators were heating up very slowly. I told him of a leak on the filling loop & he said that he didn't want to repair it as it would let air in the system & was only causing a problem when I add water to the system. So I will not be renewing my £23 per month contract. Will now have to pay an independent engineer who says they can most likely sort the problem by flushing out the individual radiators. Have been with British Gas service for 10 years & they used to be good but have noticed that the engineers & mostly now young guys trained up to sell you all they can. Goodbye British Gas in January.