It isn’t often that a production of a Mozart opera can inspire critics to foam at the mouth, and yet, the English National Opera managed it three years ago with Claixto Bieito’s mounting of Don Giovanni. “A crude, anti-musical farrago”, a “coke-fuelled fellatio fest”, and a “new nadir in the vulgar abuse of a masterpiece” were but a few of the barbs hurled ENO’s way. So what does a company do after such a spectacular critical failure? Bring it back for an encore, apparently, and the reviews (“I should sooner poke my eyes out and sell my children into slavery than sit though it again”) aren’t looking any better the second time around.