Leon starred as Hugh in Rocketman opposite Taron Egerton.

Further films credits include; Ant-Man and the Wasp: Quantumania for Marvel; Wonka for Warner Bros, The Little Mermaid and Mary Poppins Returns for Disney, Paddington 2 for Marmalade Films.

Stage credits include; Wonder.Land (National Theatre), Amadeus and Barnum (Chichester Festival Theatre) and notably Leon played Billy Elliot in Billy Elliott: The Musical (2005) directed by Stephen Daldry.