I have been reluctant to comment on this post till now as I know it will be looked on in a bad light.
Firstly I live 2 mins away from where this happened and the lane that the car driver was in is dedicated to going straight on or turning right around the roundabout. I hate this junction as every person and their family think that they can go into the right lane and force their way into traffic going left which in this case goes from one lane back into 2 (Check google maps). I have had many a complaint with idiots on the road that fully believe they are entitled to turn left from the right lane but the marking and signage clearly states the opposite.
Secondly, I am not condoning what nelsonmf has done as it was dangerous but I think he uses this junction alot as well and it is just frustrating.
I have even seen emergency personel including police do it the wrong way and have had words with them at the next traffic lights where they have told me I am incorrect where I have always offered to go back to the junction with them stating they could fine me if I was wrong but surprisingly enough they dont take me up on the offer. The worst reply I had was from an ambulance driver (not on call) stating that I should **** off.
I am not looking for a slanging match on this just wanted to give my opinion on this junction. Ride safe and dont always believe people will do as instructed.