There aren't really, it's more about the sense of confusion you feel - particularly as a learner, because it isn't easy to work out what you should indicate, particularly if going from London Street to abbey road. You aren't going straight on so you need to indicate to let the cars behind / approaching know you want to turn, but you also aren't going right. I'm not sure the instructors can even agree on the protocol.But having not used the junction, I do not see any pressing problems negotiating it, but I do have over 50 yrs road experience.
I think it was previously a roundabout and that didn't work either.