Wow gazb2, I'm really sorry to hear that. That was pretty inconsiderate of them... to warn with less than 24 hours notice.
I sent them an email right away asking whether they're planning to cancel Stage 1 in Whiteley next Tuesday. I have already bought the plane tickets and I have already booked the hotel, but as long as they warn me until Sunday night I guess I can cancel everything, no problem. But if they warn me on Monday afternoon, by that time I'll already be in London, so... yeah.
Let's just hope the weather improves over the weekend