Took me a few views to see it. Set to full screen - starts at top right hand corner at around 28secs and "flies" (see below) towards the bottom left

Theo,

Looks like a bird flying across the field of view ?? I am sure I can see its wings flapping and the way it changes direction at approximately 34secs looks very bird like?

What do you think it is ??

Best Wishes

Bill£