The traffic is very heavy and slow moving, in both directions.
Up ahead a bus is trying to turn right out of a junction and a Range Rover traveling in the opposite direction to me is trying to turn right into the same junction that the bus is trying to escape from. The Range Rover is causing a blockage behind....
As I intend to turn left in to the road the bus wants to get out of I indicate, move slightly to the centre of the road, and flash my lights at the bus and RR. The bus comes out and the RR then turns in and we all get going again. The whole thing took but a few seconds.
However, the car behind me also turns left and then, in a quiet side street, overtakes with a load of beep beeps and the finger.
He probably made up his lost few seconds by breaking the speed limit as he overtook me.