It didn't occur to me that this could be have been deliberate.
I watch the footage of the whole ride to see if these two had a previous encounter, and they hadn't.
The "Barger" first appears in the footage when he goes past me at the lights at Milbank, the Boris biker does not appear in the footage at anytime before the incident.
Sorry i cut the video off too soon, Here is a slightly longer version.
The "Barger" does stop at the lights, but makes no attempt to apologize.
The Boris Biker walks the bike around the corner and cycles off. He does look over to see if anyone is offering an apology, which they are not.
I was going to say something to the "Barger" but when i got to the lights, i was not actually sure which rider it was. (might sound silly, but I just remembered it was a guy in dark clothing with a rucksack, while i was asking Boris biker if he was ok, a similar looking rider went in front of me and i was not sure who was who).
Looking at Strava flyby, i think i can identify the cyclist. But im not going to name him.
I think the Boris Biker did amazing well to stay upright.