I think it is a fallacy that the van driver was prepared to listen and reflect on my road position or his driving conduct, in his mind all cyclists are children hence his reference to 'adult conversation'. He was incredibly rude and imposing with his vehicle even before he opened his mouth. Sure this made me notably irate however it's far better that any 'education' comes from the Metropolitan Police than from me.
I've watched the video twice now and you didn't really give him a chance to listen you kind of lose it from the 24 second mark.