Helen,

That's a really clear explanation - straightforward to follow - thanks for taking the time. The logical approach with the opening sequence of notes makes good sense too: glad it's provide useful mental stimulation in these "locked-down" times!

As you can imagine - I've listened to the 7 tunes so many times now that when I hear them played by musicians I get an instant, tingly feeling of recognition: I got that with Codiad yr Ehedydd, Begone Dull Care and Illsley but I'm not getting the same with Can Ye Sew Cushions, Miss Wardlaw's Reel or Miss Ann Bain's Fancy... There could be other tunes, from the book, with similar openings, yes...? I'm convinced your approach is right (spotting patterns, phrases) and it's going to yield results - but I'm not getting the "tinglies" just yet.

When this is all done and dusted - there's likely to be an article in this for the Antiquarian Horological Society journal: very happy to credit everyone who has helped identify the tunes :-) Looking forward to the next breakthrough...