It's up on YouTube, and the BBC put it there: the comic highlight of last week's Sondheim Prom. To get the gag, and the headline, you'll have to hang around for the last of the four or so minutes, when the most famous living Welshman other than Tom Jones sashays along with the rest and even does a little skip (especially nice choreography there). The others are Simon Russell Beale, Daniel Evans and the delicious Julian Ovenden. Best go full-width by clicking on the screen once you've set it going and flipping over to the site.
I put this and the following at the bottom of the Arts Desk review, but since I only discovered them yesterday, and many Proms have passed under the bridge since the piece went up, they might have gone unnoticed, so here's an extra shrine for them.
Seeing Dame Judi in close-up highlights what an unflashy star she is, already preparing to launch straight into heartbreak from the minute she steps on to the platform to receive the roars of the crowd (for some reason the entry seems to have been shorn since I last looked). And I repeat what I think we discussed earlier: not having much of a singing voice doesn't matter if you have the right sense of musical timing. Have you ever heard 'the one that I wanted' done with greater yearning? Takes me back to her treasured Sally Bowles in Cabaret - a performance I'm too young to have seen on stage, but delighted to have it captured for posterity on the original London cast recording. Here she is back in 1968.

It's certainly a bit irritating to be told that she and our Stately Homos Fry and Beale are National Treasures, and to hear how the home counties roar at anything they do, but there's a good reason for it.