Quite right, Johnny J. There was a rumpus on The Session about a bloke who appointed himself the expert on all things traditional Irish. Strenuous efforts were made to get evidence that he could actually play much of anything at all. The evidence was never forthcoming though one or two samples of some poor playing were dug up eventually. Repeated requests on the forum for him to prove himself were clamped down on heavily and repeat offenders were suspended. Yer man in Edinburgh had plenty of witnesses to his accomplished playing. I've come round to thinking that pressurising someone to prove their musical talent is improper and inappropriate behaviour on a discussion forum. It will not end well.