Its not good here in LGW, just spoken to a collegues in some major airlines, LGW closed at 2000 till at least midnight, due to snow/fozen runway.
Easyjet could have upto 35 LGW based aircraft out of position for tomorrow morning!
LHR is operating on a single runway currently, and the worst has yet to come, if your flying tomorrow, expect extensive delays, and no compensation!
Cheers