Thanks, T. And apologies: I see you also noted Blaenhafren, which I've now found. It's in the Welsh Congregationists' hymn book, Y Caniedydd, but I've also found the (original?) tune as a dance tune ... which is all grist to the mill!

Still, it didn't make the cut into the new (horrible, big, multi-denominational) Caneuon Ffydd so I guess it isn't considered to be in the top 993 tunes in Wales ...

sian