Sam Mendes’ production of the musical adaptation of Charlie and the Chocolate Factory is in excellent shape. Nothing indicates that more clearly than the show not missing a beat despite the fact that three understudies were called upon to perform. The company didn’t hiccup. Routines are polished and well-drilled; Mark Thompson’s wonderfully colourful, and sometimes colourless, costumes and sets are in pristine shape and conjure up the requisite sense of magic effortlessly. The tunefulness and sprightly fun of Marc Shaiman’s music remains infectious and sweet.