Once as a Professional Competitor you would join the W.D.C. As an Amateur you would join the W.D.S.F.. Then the W.D.S.F. decided to start a Professional branch of the Society.So in response the W.D.C. started a Amateur branch of its Society. I wont name which one but one of those Societies then said if you take part in any event run by the other even if you were only a program seller you would be banned from dancing in anything they run. That is why at Blackpool many would be competitors do not enter. There is a lot more to this story. I will leave it at that.