I've always assumed that this was Ding Dong, but when I was there (again) last month, a local (who's family were local miners) said it was a misapprehension. He pointed out an engine house further west towards Boskednan. His explaination seemed to be that the engine house that we were at is very visible (in fact used by shipping as a landmark) and was near enough as made any odds to Ding Dong, it became referred to as such. Anyone know if thhis is right?