Nice car.
You're obviously not sticking to the extreme left of the road where you belong.
Looks like he's a good driver too as he didn't knock you off despite your poor positioning
Looks like he is just stopping idiots going down the outside lane and cutting in at the last minute, the reason he is close behind you is to keep the space in front to a minimum to prevent vehicles pulling in at the last minute. He is queuing just like you.
did he use the right hand roundabout lane there to overtake you, to o straight ahead towards ferndown? thats by trickets cross shops. Ive had people do that loads of times, its properly annoying and dangerous.