The Little Blackenham Carol, posted above, is a variant (in text, at least) of #140 in The New Oxford Book of Carols: "Let all that are to mirth inclined." The authors include 16 verses, with a setting by [Davies] Gilbert, 1822, noting that it's "found in several forms: see 'Good People All' (162)". If someone has both Artisan's recording and the NOBC, perhaps they could compare and comment.