Tony Bennett: Palladium, London *****

THIS IS HOW to do it. At 85, Tony Bennett scampers on to the Palladium stage in a perfectly pressed suit, a folded red hankie in his breast pocket – and before he sings a note, gets a standing ovation. Made by an audience who scream like Justin Bieber fans, rather than the respectable elders they appear to be, it is a rather premature reaction. But what follows deserves it: a 75-minute masterclass in how to entertain.