I've always liked this piece, but did you catch at 2:33....the whistler loses it? About the only "mess up" in the whole piece.
Yes, I actually sort of like it....makes it a bit more personal. If you have watched any of their other stuff, they are a jolly group of Brits that have a bit of fun on stage during the performance....I think the crack-up from the whistler is from something related to what was going on just before the song.