Thanks for the responses everyone. My problem is only partially to do with the cancellation. It happens sometimes, and when it's happened before it's been sorted pretty efficiently.
However today there has been so little information. No staff at the airport, presumably because they don't want to face angry passengers. Everything was done over the tannoy, until we were all standing outside, where there was a lady organising taxis for us all.
They must have known for hours that this flight was not going to happen. So why weren't we told to stay away from the airport? Why did they leave it so late that my kids ended up getting to bed after midnight?
And right now we have no information whatsoever about tomorrow's flight. If there is one. This is the problem. No information. No organisation.