Graham Nice to be reminded that clogging happens outside of Appalachia and Broadway (Riverdance). Here in Western New England we have Northwest Morris (sound familiar?) that involves multiples of eight dancers--all wearing steel shod clogs. It is centered on the figures, and the footwork is simple ranting (thank goodness!).A few dancers have taken to what is locally refered to "Marley Dancing"--after a Conneticut family of some former renown. I'm guessing that their probable roots are shared with your pitman cloggers.
Lucius