To be honest, I'm not sure what the problem is. DA16 looked like it was keeping a safe distance away, though clearly would have over-taken you given half the chance, and you had allowed a 100 yard gap to develop between you and the red car ahead. There was one point where he got close but otherwise drew back and wasn't tailgating. I suffer far far worse every day.
My daughter is a learner driver and my daughter was driving the speed limit and he raced up behind her started to wave his hand (aggrevie hand gestures ) and flashed his lights and called her a d*ckhead at the traffic lights, then we went to take a picture of him and he ran the red light to get away from him
To be honest, I'm not sure what the problem is. DA16 looked like it was keeping a safe distance away, though clearly would have over-taken you given half the chance, and you had allowed a 100 yard gap to develop between you and the red car ahead. There was one point where he got close but otherwise drew back and wasn't tailgating. I suffer far far worse every day.