About a minute and a half in, I was about 80% sure the narrator was Geraint Wyn Davies. Then, right as I determined via Google that I just wasn't going to be able to confirm that online, the express virtual tour got to Swansea, and that jumped to about 98%. I've been to a performance of Do Not Go Gently. Ger quoting Dylan Thomas is pretty unmistakable.
I'll edit to confirm or admit I'm wrong when the credits roll. :-)
Edit: Or bentleywg could find and confirm it before then. \o/ Thanks for that, and for the direct link to watch it online at the WLIW site.
(Not pouting about its being infeasible to go up to Stratford this year to see him in Camelot. Not not not. Which is, ironically enough, the choice I made in February when I decided to make the UK trip.)