UFO or large smoke ring
Warwick Castle testing fireworks
BBC News - What was the mysterious black ring in Leamington Spa?
Worst use of the word Expert this week -
'In theory you can fake most things, says Iain McArthur, an expert at Audio Video Forensics. For instance, the footage wobbles. You can fake this handheld look. But other elements seem to ring true, he says. There's a "blob" on the top right and top left of the ring, suggesting movement - "something organic", he says'
It's clearly smoke. I've seen this with fireworks and I've seen this with explosives. A ball of smoke with a column of faster moving air, just the same as a smoker making smoke rings.
I'm not an expert either