I once had to orbit during my PPL solo time due to another aircraft blindly entering the circuit and nearly hitting the aircraft in front of me. I made a left hand orbit in a right hand circuit to give spacing (as best advised by the aircraft ahead) and was advised by my instructor when on the ground (if my memory serves me correctly) that I should have made a right hand orbit....this of course was a few years ago, theres a slight possibility that it could be vice versa!