Is this one of these spoof comedy shows?
I am a regular cyclist (and driver) in that part of London - and have been so for over thirty years.
The driving was poor-to-middling, but by no means unusual.
The headcammer appeared (to my untrained eye) slightly madder than a box of slightly mad frogs.
He was passed quite closely, as were the other cyclists, but these things happen.
He then barged past on the inside of the 'victim', shouting about stopping the driver. It all got slightly weird.
I was unaware initially that the horn was on the headcammer's bicycle. Its use was bizarre, intimidatory and excessive.
The driver appeared to accept he'd driven badly, but this was not enough for our vigilante of truth and justice.
Bizarrely, having honked and yelled for some time, he steps beyond irony by telling the bemused driver to stop shouting.
I couldn't watch to the end, so I have no idea whether the 'victim' appeared.
This cyclo-vigilante doesn't represent me, doesn't dignify cycling and doesn't make the roads safer. I think he's very clever to do all that shouting and riding and honking and amateur policing... But if it's for anything more than entertainment, it has me baffled.