Not a good start to the day, Woke up to find the central heating hadn't come on. The thermostat in the hall was reading 10c. Bit of a problem, as the code on the boiler display didn't tell me what was wrong, when I looked at the fault codes list in the instructions. Bigger problem, as my friend who installed the boiler four years ago and only serviced it a month or so ago was away. O.K. I''ll call British Gas. I'm paying them a fortune at the moment for gas and electricity, so they can come out and fix it. I don't mind what it costs. There was an answer the moment I rang. Unfortunately, it was an automated message and I had to listen to a two minute lecture on Covid before being asked to press any buttons. I chose the one for, "home care customers" this is for people who pay monthly what equates to a fortune for a call-out on a rare occasion when a boiler will break down. I could have got another new boiler, for what I would have paid over four years, as by now, it would have cost me, over £1,000, for this service. I pressed this button, as I expected to get a quicker response. I did, another automated message to tell me I was in a queue and it would be an hour before I would get a response, let alone someone to come out and fix it. I know the weather is unusually bad, but if I were paying this sort of money monthly, I'd be "less than pleased." Anyway, I thought it couldn't be much, so had a think about it. I remembered on a couple of nights I'd noticed a small amount of water on the patio under the vent pipe on the kitchen wall. All combi's "vent" a small amount of water. With our's the little pipe comes out of the kitchen wall and the water dips into a bit of 1.5" drain pipe that connects to the waste from the washing machine and dishwasher. I worked out maybe the water dripping down this vertical pipe had started freezing to the side of the pipe over a few days. So the water was dripping onto the patio meaning that there was a chance that the little pipe was frozen too. So I pulled the connection off the little pipe and a cup-full of water came out of that pipe. I poked a screwdriver up that pipe and some slush came out. Turned the boiler back on and we were all systems go! I've left the connection off the end of the pipe so it can carry on dripping onto the patio.