Clearly impossible
"...a UAV collided with the....Flying Scotsman over the weekend..."
Nope. Clearly impossible. Obviously didn't happen.
From another story on el Reg, "We estimate that 6.12 x 10^−6 collisions will cause damage to an aircraft for every 100,000 hours of 2kg UAS flight time."
There are at least 100,000x more aircraft than Flying Scotsmen, so the odds of collision with any given Flying Scotsman must therefore be 100,000x lower than an aircraft. This works out to about..., very roughly..., approximately..., rough order of magnitude, ...
Exactly 6.12 x 10^-11.
So the report is clearly nonsense. IT DIDN'T HAPPEN. ;-)