I have heard that the BA staff that de-ice the aircraft are also the same people that operate the pushback tugs. Thus if some are buy de-icing, there are insufficient bods remaining to push back aircraft ready to depart. Seems a hole in contingency planning, if you ask me.
BBC reporting that new snow equipment for LGW is stuck on the Continent due to the poor weather. How ironic. Easyjet has already cancelled all AM departures from LGW tomorrow, in anticipation of the arrival of snow.
Good luck getting where you need to go!