I drive for a living in London so I see a lot. My list includes:
Tipper Lorrys, as above, they must have the handling of a sports car the way they are driven.
Scaffold Lorrys: thugs of the road
Royal Mail: Variable, some OK some are shocking
Couriers: Again some OK some real nightmares
Trunk run lorrys(Royal Mail/courier companies) absolute ****! Ever come down archway hill with one of those bearing down on you. I have been rear ended at archway roundabout by one of these.
PCO minincabs(including Uber): Addison Lee are the better end of the business and some are ok but(massive generalisation), overall the African drivers tend to be aggressive and poor drivers whereas the Asian chaps are just poor drivers. For example, my run into town comes down the M1 and I often see above minincabs on the Luton airport run. Driving at 40mph in the middle lane of the m1 with the interior light on whilst they check their PDA for work.
White Van men: Some real chimp brains here but some really good professional drivers
Bus drivers: Ok
Wannabe gangsters: you can spot them a mile away in their blacked out mercs/bmw/audis. Just avoid.
Cyclists: broken down into the regular commuters(good, aware of the surrounding traffic) that ride in all weather to the nice weather cyclist who is clueless. Boris bike tourists(we drive on the left hand side of the road you chimps!!)
Pedestrians: probably the biggest source of stress for me as a road user. Nobody is paying attention/glued to their phones and putting themselves in stupidly dangerous situations. And then giving a little sorry wave when I swerve around their absent minded lurch into traffic.
School run Mum’s: nightmares!!
Ghetto princess: usually drive an older BMW X5, merc suv etc. Extremely aggressive, dangerous attitude, best avoided