I've seen this a couple of times before and cant help wondering, why haven't the gvernment put something like this on the television? City centres are the worst places you encounter this most often. I've had cyclists bang on the door when moving off from traffic lights, even though I have been indicating, they have still ridden up from behind and placed themselves in my blind spot.
Used artics in london fitted with cameras on nearside mirrors with wide angle view that come live when the left indicator is swithed on or the hazards complete with loud audible warning , 'warning vehicle turning left ' totally ignored....