We went last night to the first night of Thomas Adès’s new opera The Exterminating Angel (well, not quite new because it was performed last year at the Salzburg Festival):  a brilliant, macabre, musically loud and unplaceably complex study of a group of people – the haut bourgeois – at a dinner party and unable to escape, so watch each other’s filthy moral decay.   Based on Luis Buñuel’s 1962 film El ángel exterminador, which I haven’t seen, it has been adapted and directed beautifully by Tom Cairns.