yea, fair point on the video, not really an expert in this stuff. It would have shown the speeds involved and that I had to jam on the brakes and that he then then stopped and blocked the exit (the lorry was stationary).
Ah, but your mistake was thinking that a BMW driver (even driving an old beat-up one) would actually stop, roundabout or not! He's now moving onto tailgating the pickup in front no doubt.
Surprised it passed the MOT, must be driven by a little old man