Thanks, Keith. I'll check out Limbo and get back to you.

Regarding the song here I'd hazard a guess about 1725. This based on it's not in D'Urfey and it would have been prime material for him.

Jon, in that case what did you mean by ' the folderols seems to occupy only the entire second half of the final stanza'? Surely they are the chorus. I'll post the Williams version shortly which has more of the chorus.