BMW driver far too important to queue with the rest of us. Left filter lane for straight ahead ONLY traffic and the right filter lane for traffic turning right at the roundabout. FF to 40 seconds to skip past queuing traffic. Thank you for all the comments, both for and against my actions. Right hand lane queues frequently form at this roundabout and I witness queue jumping here regularly. There are numerous signs and road markings leading up to the roundabout to advise which lane you should use. I may be wrong but I think this driver knew exactly what he was doing. Thanks again for your feedback.