I'm not sure where you see any provoking in the video.
I don't know how different the laws are in the UK, but in the US, a cyclist has the same rights (and responsibilities) on the road as any other vehicle. This includes the right to ride in a traffic lane.
This fact is commmonly misunderstood (by both sides), and is often at the base of issues between cyclists and drivers.
+1. Plus, the cyclist is riding in the left lane (the slow lane in the UK), and there appears to be plenty of room in the right lane for the bus to pass safely.