This might help if anyone has a condenser boiler and it cuts out.
If you have a pipe on the outside wall it will be to take away the water it produces. The pipe can freeze and cause the boiler to cut out.
Pour a few kettles of hot water over the pipe and re-start the boiler. If it makes a gurgling sound it is still blocked. If not it should be OK.
Just happened to me and my plumber mate told me what to do.
Keep warm everyone