I was about to post on that very subject
I flew in from Spain with BA and was heading home for a visit to Newcastle on Thursday when I was told in Valencia by Iberia that my flight to Newcastle was cancelled but I'd be ok to catch the flight on Friday.
Arrived at Heathrow and the BA CS told me the flight was cancelled and that it was likely due to the weather that the flights on Saturday would be cancelled. Wasn't too impressed as I would have arranged flights into an airport with flights into Newcastle.
I asked for my options and was told I could take the train or that BA would put me in a hotel for the Friday but not the Saturday. I asked for a refund and it took an age as they couldn't work out the value of the flight to Newcastle as I was travelling VLC-MAD-LHR-NCL
I asked why Easyjet and FlyBe were able to operate into Newcastle and was told 'they have a different weather policy' by the CS girl.
In the end BA paid for me to be taxi'd to Gatwick and I bought my own flight with flybe.
Cancelled my return with BA and will route via CDG instead