It's Morning Dew which is normally a reel, though the Chieftains give it more of a hornpipe "bounce" and leave some of the notes out (to good effect IMO). So if you find the dots you may wind up with more quavers in the bar than you want, and will have to pick this version out from it. But it's the same tune. It's on one of the earlier Chieftains albums, C's 4 or C's 5 (possibly C's 3) - try looking for a discography.

Interesting to see the photos of Harry Boland, and I didn't know he'd been in Lewes Gaol (wonder if he was around during Bonfire Night and what he'd have made of it). Nice video clips, those.