It’s taken Elton John and partner David Furnish the best part of two decades to produce Rocketman. That’s one hell of a dedicated vanity project. Now, with Dexter Fletcher at the helm, the dream has become a whiz-banging reality, albeit one with a relatively loose grasp on the truth. Rocketman is glitzy, fantastical and increasingly dark entertainment. The more Elton loses control on screen, the more Fletcher seizes it behind. Come for the music, take away surprisingly acute insight into the nature of addiction and the pitfalls of fame.