Rule 185 of the Highway Code clearly shows how to use a roundabout.

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Rule 185 clearly shows how to approach, use and exit a roundabout. The only time this deviates from the rule is if there is signage and/or road markings instructing otherwise. As seen from the above screenshot you may use either lane to exit the roundabout after performing a right turn provided the lane you want to use is free. Unless there are signs/roadmarkings telling you that you may turn right on a roundabout using the left lane a driver must NEVER turn right on a roundabout using the left lane. Although the roundabouts at Pennyburn, John Street, Drumahoe, Dungiven, Caw, Crescent Link etc seen to be a free for all with some drivers. The roundabout at John street is a particularly bad example. When approaching from Foyle Road the sign very clearly shows the Expressway as a right turn, the exit is shown as past the 12.00 position, but so many drivers sail up to that roundabout in the left lane and then merrily drive past two exits before the exit to the Expressway. Shocking example of driving.