There are many rules in the highway code which govern how you should circulate on a roundabout (including how to approach and exit a roundabout). Obviously, all the usual rules apply – check your mirrors, signal and manoeuvre. You should also decide early on which exit you wish to take and ensure you are in the correct lane (before entering the roundabout) for your intended route.
It is a MUST that when you are approaching a roundabout that you give way to road users to your right who are already established on the roundabout.
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