dbt, yes you are correct about Kiveton Park Folk club. There are not many miners left around here these days, like a lot of places and none visits the club now. However I was at a birthday bash yesterday and one of our ex-members told me, as many have over the last 2 weeks or so, that he recognises and has used the term but can't give me it's origin. However,Natalie Braber, who was suggested by LFF has replied to my mail. Although she cannot give a positive answer at the moment, she is very interested and will expand the search from her end.
So maybe the net tightens on the elusive Dudley?

Also thanks to Dave Nutall for info on the Wakefield Folk Club sessions. Can't get along to the next event but will bear in mind for the future

Regards to all

Andy