“I’ve seen an asp, a hydra, a basilisk”, Fiordiligi sings as she tries to ward off Ferrando in the second act of Mozart’s cynical dissection of true love. Benjamin Davis’s new production for WNO converts these beasts into a crocodile, a dragon, assorted dogs and a teddy bear: and not as figments of Fiordiligi’s overheated imagination, but as the all too real promenade furniture of whichever British seaside resort Davis and his designer, Max Jones, have chosen as their 1950s version of 1780s Naples.

What a relief, for half of last night's semi-staged concert performance, to have left behind Britten's claustrophobic wood at English National Opera and to seek refuge in Smetana's Bohemian village inn of good cheer.

Just think, said a veteran enthusiast of Britten's operas when I showed him the earliest publicity designs for Christopher Alden's production, you could set them all in a school, even Gloriana - what about headmistress Bess and head prefect Essex? But could you squidge everything into the one shape, I wondered? At ENO, it makes instant sense in the composer's near-perfect musical translation of Shakespearean wood magic that Oberon is the schoolmaster who prefers changeling pre-pubescents to now-adolescent, discarded Pucks. That's the strongest of starting points.

Anything goes in the wacky world of Berlioz’s Faust story. It’s a heaven and hell of a lot better than Gounod’s, but it isn’t an opera, it isn’t an oratorio and it certainly isn’t the gospel according to Goethe. So Terry Gilliam, ENO’s latest wild-card debut director, was right not to play by all of the composer’s already rather warped rules. At first you sigh: not the Nazis and the Holocaust again. But only an oddball visionary like Gilliam is going to come anywhere near the often disorienting musical pictures painted by the most original of Romantics.

We all knew about the throat problems and the vocal-cord-threatening surgery. But Rolando Villazón's post-operation return to the Royal Opera House last night appeared to reveal heart issues too. At least that was the only way I could explain the endless arm-swinging and chest-clutching. Twenty, perhaps 30, times he clutched and swung. Surely this wasn't Villazón's attempt to characterise Werther's heartache, was it?

Janáček’s stark Prelude is a stunner: there’s no conventional beginning, no conventional thematic development; it simply starts, as if a light switch has been flicked on, and the baleful opening theme is distorted, repeated, squeezed until it leads into an extraordinary stretch of solo violin writing. Based on Dostoevsky’s novel,  Janáček’s final opera isn’t a faithful adaptation – it’s a selection of loosely linked scenes spread over three concise acts.

Long before the curtain rose on this soapy operatic tale of power and poison, one big question loomed: could director Paul Curran, could anyone, bring Rimsky-Korsakov's sweet, doomed and very Russian bride to convincing life? The music's mostly strong, and unusually singer-friendly for this composer; the historically dodgy plot's patchy, but not inimical to resetting in the queasy milieu of the new Russian rich. Given the bloodstained start in a swish Moscow restaurant, I thought Curran could be on to something, but by the end of the evening it was just a tawdry old melodrama dressed up in flashy suits.