If you look at his eyes he is not looking at the cyclist, he is looking at the wing mirror. He doesn't appear to be shouting or angry. He could actually be adjusting his wing mirror.
Either that or he is trying to grab the flag on the back of the bike. I don't think he is trying to push him off.
I think this would really struggle in court.
Is there any more to the story?
If you need any insight into the area it happened, it is quite normal to see drivers and passengers not wearing their seatbelts. It is also not really somewhere that you go unless you live there as it's landlocked to the north and east, so he'll be local. And he has no reason to be on that side of the road other than to give the cyclist a fright. The bus managed to pass the cyclist without coming that close.
It's also an area that has quite a few cyclists in it, as there are a couple of useful cycle paths which cut across where the cars can't go.
But the local policeman there is often seen out on his bike, and is really nice. He also issues lots of tickets to cars parked obstructing pavements!
