Gilbert & Sullivan’s Iolanthe review: An opera with a cast that is pretty close to perfect

CAL McCRYSTAL’S genius for slapstick – which he brought to the comedy One Man, Two Guvnors and the Paddington Bear films – now lights on Iolanthe, WS Gilbert and Sir Arthur Sullivan’s unjustly neglected satire about a dispute between Fairyland and the House of Lords.