This is what I wrote in a thread during 2009 Krissy, hope it helps!
As for driving, just keep it nice and slow and the locals will recognize you as visitors. As for our roundabouts, treat them as a clock face as you approach ie quarter to twelve, twelve o'clock and quarter past twelve. Want to turn left (quarter to twelve) stay in the left lane, want to go straight over (Twelve o'clock) stay in the middle lane, want to turn right (quarter past twelve) get into the right hand lane. If there are only two lanes as you approach stay in the left lane for quarter to twelve and twelve o'clock. Want to turn right get in the right hand lane (quarter past twelve). There, simple!! Good luck anyway.