How to deal with roundabouts - which lane for first exit left?
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:
1st exit left:
Indicate left on the approach, and keep in the left lane. Some roundabouts allow a left turn in the middle lane (3-lane), or right lane (2-lane). Use these with extreme caution as there could be conflicting traffic on your left. You would normally only use one of these lanes if you were going to turn right immediately after your exit.