Kevin !Eureka!
I always knew that I had heard the tune before, but couldn't put my finger on it. Another little niggle is cleared up.
By the way, did you know that Bert Lloyd - always a man with an ear for a good tune - used the Welsh tune for 'Lisa Lan' in his 'I am a hand-weaver to my trade' song- reconstructed from an Oldham broadside ballad, I believe. Maybe next time I'm at the Old R&C I will sing the Welsh version...