The SPECS things were the precipitant of this obviously. however, there are lessons we can all learn from your post. Thank you for your honesty in sharing it. I need to be careful not to come across as self-righteous here. If it reads that way, please accept my advance apologies. I don't have time to proof-read and/or reflavour it.
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I managed to swerve round him, tapping my NS door mirror on his rear quarter as I went past (that's how close we got!) - luckily there wasn't anyone on my right or I'd probably have pushed them into the Armco.
Two things from this.
First and foremost, well done for averting what could have been a nasty incident. Having an escape lane is always good planning. However, were you *certain* nothing was steaming up the outside? Had you sideswiped anyone it might have been DRAMATICALLY and possibly fatally worse than shunting into the arse that did the pull-in-and-brake manoeuvre.
Secondly, the door mirror "tap" may not have caused any damage, but strictly speaking you should have stopped and checked - together. If the arse got your number and has any chipped painty as a result, you may get a visit from the BiB for "failure to stop".
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he accelerated hard again and was right behind me when I turned off at the roundabout
Well done again for resisting any urge to retaliate.