Missing Arrows for the A1307 roundabout at Babraham?

The busy roundabout along the A1307 with a turnoff to the Babraham Institute has two lanes leading into it. The County say there are no direction arrows on the road surface to ensure traffic flow - local residents and the parish council say the arrows are needed to prevent cars cutting up on the inside lane and making things dangerous, and they should have been put in long ago.
I have asked the road safety team at the  County to investigate and give some options - and that local people need to be involved in exploring those options, not presented with a fait accompli.