Please report dangerous drivers to the police - Roadsafe. Report to plod, not just whinge here.

We can be as many abreast as we like in an advanced stop box. There is no guidance in the highway code on that. The WHOLE space is marked with a cycle symbol. It is ALL there for cyclists. The driver was clearly getting irked by cyclists getting ahead of him.
Having a word at the next set of lights might have been a bit over the top, but is legal. Getting out and lumping someone is a serious offence though.

Actually the rule applys on all roads. The advanced stop box is as relevant as a yellow line.

https://www.gov.uk/rules-for-cyclists-59-to-82/overview-59-to-71

66

You should

[]keep both hands on the handlebars except when signalling or changing gear
[]keep both feet on the pedals
[*]never ride more than two abreast, and ride in single file on narrow or busy roads and when riding round bends
[]not ride close behind another vehicle
[]not carry anything which will affect your balance or may get tangled up with your wheels or chain
[*]be considerate of other road users, particularly blind and partially sighted pedestrians. Let them know you are there when necessary, for example, by ringing your bell if you have one. It is recommended that a bell be fitted.