I frequently see drivers turning right into & out of Wickes. Usually they cause the whole of the south circular to grind to a halt.
South Circular is a big old road, I cant see occasional cars turning right causing too much disruption to an already messed up road.
There are plenty of right turns along its way which cause more problems, but for some reason this one was chosen. Probably because its one of the most awkward to find an alternative route to.