I'll post this while it's still clear in my mind.
I woke this morning at 07:18 and thought I'd have a short snooze before getting up for my daily commute (downstairs to the conservatory) at 07:45.
Had one of those truly bizarre and very vivid dreams that seem to cram an awful lot into a very short time.
I hope it was not a premonition.
I was at some sort of pageant or celebration for a national event.
The venue was a large, sprawling castle - vaguely like Cardiff castle, but with a lake nearby.
There were huge crowds milling around and some performers, mingling with the crowd were dressed in medieval costume. This figured in some kind of competition, whereby younger members of the audience would challenge the actors in period costume, who would reply with a code word and all those who collected every code word won a prize.
There was also an air display. I looked up and saw a large, delta-winged aircraft flying in formation with three (I think) small aircraft. The large aircraft, which looked vaguely like a Vulcan bomber or possibly even Concorde, was painted in a very strange livery. No wartime camouflage, but abstract red and blue swirls on a white background.
The large aircraft seemed to be flying dangerously low and, on one circuit, as it banked across my field of view from left to right, its starboard wing-tip hit the roof of a row of houses on the perimeter of the castle grounds. I heard the noise and saw the wing ripple before the aircraft went out of sight. I knew it had crashed into the lake.
Next scene was a newsroom, with a sombre looking man in a dark suit announcing "seven confirmed dead" and the final scene was sometime later and a memorial service was being held at the lakeside.
My iPad's alarm then woke me up and the entire dream scenario had played out in around 12 minutes.