Full details about the correct procedure at roundabouts are contained in Rules 184 to 190. Roundabouts can be hazardous and should be approached with care.
You may feel safer walking your cycle round on the pavement or verge. If you decide to ride round keeping to the left-hand lane you should
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.