Exit to Perkins Engines. 180 degree rule.
On approaching roundabouts we normally stay to the left if the exit is less than 180 degrees (half a circle, or less than 12 o'clock).
The exception is if the signs and / or paint says otherwise.
If you are coming from Stanground and you want to go to Perkins Engines, McDonalds, Pizza Hut etc. then you need to follow the signs and stay in the Centre Lane (see orange line). This becomes the outside lane after the exit to the Frank Perkins Parkway and you follow this onto Carr Road.
The exit onto Boongate can be tricky at times and if you cannot get out then "go round the roundabout again", you cannot pull out hoping the car on your left will slow down, they may not.