How to deal with roundabouts - which lane for an exit described as a right turn?
The general rule is keep left unless you are turning right, unless road markings tell you differently, or you are overtaking. If there are no road markings to contradict, then the following applies:
Any exit to the right:
Indicate right on the approach, keep in the right lane, and indicate left to exit. Try to exit in the left lane if it is clear. If the left lane isn't clear and there is a right lane, exit in that. In extreme circumstances you may need to go around full circle if you are unable to exit safely because of traffic on your left side.