Topsy-Turvy is the only Mike Leigh film I've seen. I had long ago tried another of his (I think it was Naked), and just couldn't get into it. Well, those days are past, because after listening to him talk about G&S for well over three hours in total and how this film is actually consistent with his other works in certain crucial aspects, I'm ready.
(Vixmom: this is the Criterion edition, which I VERY highly recommend.)
He is all about the working class - how it functions, the fact that it's made up of individuals as opposed to just an undefined mass of humanity, and its relation to the world around it. So, although Topsy-Turvy is, on the surface, a bio-pic about G&S and their operas and the Victorian theatre, he zeroes in on the nuts and bolts of each individual's function in that world. His close-ups of makeup, wig lines, perspiration are one thing. (In addition to the theatrical conditions, London happens to be experiencing a record breaking summer heat wave.) His devotion to gradually zeroing in on the chorus as an ensemble made up of a variety of individuals, and how that shapes events, are another.
I'm not done yet. Back later with more.