It is a 50/50. How he takes the instant time to get angry at every pass to the point of verbally expressing his anger. At the same time, Drivers in London, aren't considerate about those around them.

With the amount of anger he has, I started to wonder if he was provoking some of the incidents.

Sure living in the DC-Metro region I get a lot of close passes, but a close pass in and of itself as to its' severity, also has to do with my road position. If I encounter a close pass by stupidly 'hugging the curb' of course I am going to be angry. But if I get a close pass while 'taking the lane', I am not going to be anywhere near as upset. Because, If I am riding in the left tire track when I encounter a close pass, I will have room to adjust. But I will not have room to adjust if I am 'hugging the curb'. That is why I consistently 'take the lane'.