Stephen Sondheim, A Celebration: Judi Dench proves the first among stellar equals in this bravura tribute

• On Tuesday, the Sondheim Theatre swapped the Les Misérables barricades for Broadway Babies with a one-night-only gala in honour of its namesake, who died last November. Stephen Sondheim always considered London his second home, proclaimed producer Cameron Mackintosh in his introduction to this star-studded concert (which he also devised), and now his “old friends” in Britain had come together to pay tribute.