I smirked when both Sky and BBC News said 'Heathrow have cancelled 10% of their flights'. Wonder if they told the airlines?
It's testament to the pulling power of LHR that the airlines don't tell the airport that unless they begin to understand who their customers are, they'll walk - to other airports such as BHX / STN / LTN or LGW.
The fact that Heathrow Airport Ltd. can get away with it allows them to take such a cavalier attitude.