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Thanks for the advice everyone. Normally, this sort of thing hardly ever happens here. I have posted a screenshot of the road and the red arrow indicates my position. It was 7.30am, hardly any cars on the road. I was sat in the ASL, patiently waiting for the lights to change. As you can all see from the shot, the left turn lane is very clearly indicated. As the lights changed, I went forwards in the right hand lane which is for going straight on. I was just over the crossing when Mr Dimwit shot past on my left. It wasn't like 30mph, looked more like 40mph. He braked when he caught up with the line of cars and then swerved to overtake them all on the right. If you follow the road on Google Maps, you'll see it curves around to the right before straightening out. This guy was in a hurry and took one big risk in overtaking on a bend.
He stopped at the lights at the end, so as I came down the left lane (I work around the corner) still fuming, I managed to control myself which, to be honest, I sometimes find difficult in encounters like this. I think it's probably the heady mix of adrenalin and testosterone

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I had a few seconds before the lights changed, so this is what I said:
"Excuse me, you cut me up back there. It's dangrous and illegal, your riding is s***, don't do it again"
Which I think is about as controlled as I could be with heart still racing. He looked genuinly suprised to see me, so I hope he gave it some thought. Anyway, made me feel better at chastising him.
By odd coincidence, my helmet cam was not running - full SD card. If it had been, I would have said this:
"Excuse me mate, you illegally cut me up back there. It's dangerous and I would search for your number plate on Youtube tonight"
On the other encounters, one was with an L-plated biker who, just nipped through as the lights changed and was a fair distance from me, but undertook all the same. The car driver who did it to me learnt his lesson - almost went into the back of stationary cars on the other side of the junction

. This junction got redesigned a few years ago when a new gas main was installed. It used to have a rubbish little cycle lane down the left, but now the road splits into two lanes just before the petrol station.
Anyway, that's my tuppence worth. I shall heed your advice Gaz and try to be cool about things. Oddly enough, with the helmet cam on my head, hardly anything happens.