Andrew Lloyd Webber’s 1984 train musical Starlight Express has come steaming back into London and, says the Telegraph’s Chief Theatre Critic Dominic Cavendish, “is out of this world”.

Is it a musical? Is it a roller derby? Is it a game-show? When the roller-skating phenomenon that is "Starlight Express" opened in London in 1984 it was all of those and more, as evidenced by its ...