A pre-planned cancellation of a third of all flights indicates a serious concern that Heathrow will not be able to support normal operations.
12 months ago, I recall the public relations people at BAA making a big fuss over the new investment in equipment to deal with snow and how it would keep their airports working whatever white powdery stuff may fall from the sky.
I'm sure the money means that Heathrow now has lots of big machines painted in birght colours that make very loud noises, have big flashing lights, and would make Jeremy Clarkson terribly excited.
May I ask however what that investment has purchased in terms of keeping runways open and flight operations normal ?