A golden ticket doesn't buy you much these days – a cut-rate touring musical with chintzy sets, a mediocre score and about as much joy as you'd find in a board meeting about turning wacky movies into boring musicals. You'd be justified in hoping for more from Charlie and the Chocolate Factory, a new musical re-working of the 1964 novel by Roald Dahl and the 1971 film Willy Wonka and the Chocolate Factory.