I keep expecting that extraordinary footage to be denounced as a spoof, fake news, manipulated, CGI - just anything but the real thing!
I've seen many a motorcade in London, and everyone has seen in the past year the ariel shots of the various PMs going to the Palace, etc., and the MO is always the same: one outrider goes upfront to halt the traffic, various cars and outriders follow, then there's the slick choreography of the outriders as they take turns to lead - all at great speed.
The idea is to move at a fast pace so the PM, Queen, visiting president etc is not a sitting target, not dawdle so slowly that unfit police officers can puff alongside.
In addition to the joggers there were the many bobbies on bikes - what was going on? And so many officers!
Today it was announced that The Met is 1000 officers short.
I'm at a loss to think what it was all about.