Funnily enough I came through there earlier via the flyover and wanted to get into the left lanes. I was in a lorry so couldn't really see what was by the side of me to my left, there were cars cutting in from the left to go right, it was chaos

I'm guessing it's easier/safer to join the slip road before the flyover and go through the roundabout which brings you out in the left lanes the other side of the flyover?