[derekgas]

just a note to people with condensing boilers, the regs say that the white pipe should be lagged if it extends to the outside, or, should be upsized, and this would prevent freezing, we have however, had several calls to boilers not working (around 12), every one had a frozen condense pipe, as it will freexe again tonight, I would advise that you turn the hot water side off, or down (dependent on system) and try not to use hot water late at night, if your boiler does stop working, pour hot water on the pipe outside and reset the boiler, if you wish, you can call an engineer who will charge you to do exactly the same! Keep warm!