Horatio- yes- you got it first! I skimmed your post where you mentioned it..
Still- took a while for folk to cotton on!
I’ve only ever seen stuff like this when it’s a big VIP (ie PM, FM ETC) up here in Glasgow and it’s been a motorcade type scenario with outriders- was on the 5th floor of our office and heard them coming from about half a mile away- very very impressive watching them scythe their way through about 8 or 9 junctions..
The boys/girls on the bikes were doing a hell of a speed to catch up then overlap the 5 or 6 motors in the middle. Bonkers.
Anyways, comments like- it’s London, it happens etc.. Fine. But the copper was still an asshat pulling across like that, cp or not cp..