Bizet’s Le docteur Miracle is no serious opera: it is, by contrast, frivolous in the extreme. Uniquely among operettas, it contains a (beautifully-written) quartet in praise of an omelette – which turns out to be inedible, though musically mouthwatering. A sense of paranoid surrealism abounds. There’s something innately French about proceedings, yet it plays directly to British sensibilities…