It's a bit late but I've just come across this post.
I've got too much stuff on humpenscrumps/humstrums to put here, but if anyone wants a list, e-mail me.
Ron Shuttleworth,
41 Morningside, Coventry, CV5 6PD. tel 024 7667 6721.
Keeper of the Morris Ring Folk-Play Archive.
2500-plus itams, available to anyone.
https://folkplayarchive.co.uk/