the handful of people here can prove that they aren't, on the basis of not having seen them.
No. Every single contributor, with not one agreeing that they are common.

I have produced evidence that they were still around as late as 2010
Reminder please.

Those who claim otherwise have not produced one single shred of solid evidence to back up their case - if that is not true - please point out something I have missed.

What evidence do you want apart from the actual absence of any signs and the absence of anyone living in Britain who has seen one in years?