In reply to Fraser:
Thanks guys, we did google it, but it come across as what is commonly known as twisting but without enough technique to rotate the foot. Ie rather than twisting on the toe, they take their foot off and put it on backwards to outside edge. In other words its bad technique.
We found it so odd for an English board of A level to be using an American version of poor technique that assumed it can't be the intended technique??? Any other ideas? I'm thinking if the entire climbing community in the UK doesn't know what is meant by 'back stepping' then quite possibly it isn't a UK technique.