Rule 80
Give plenty of room to long vehicles on the roundabout as they need more space to manoeuvre. Do not ride in the space they need to get round the roundabout. It may be safer to wait until they have cleared the roundabout.
SteerTogether · Official English reference
Read rule 80
Cyclists: rules 59–82
Study cycling equipment, positioning, junctions, roundabouts and crossing guidance to understand how cyclists use the road.
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