- Joined the National Youth Theater in London as a teenager at the same time Matt Smith was attending.
- His twin brother is actor Harry Treadaway; the pair played conjoined twins in the film Brothers of the Head (2005).
- Starred as Albert in the original National Theatre production of War Horse in 2007 and also voiced the role for a BBC Radio production.
- Appeared in The Script's music video "For The First Time."
- Starred in the West End production of The Curious Incident of the Dog in the Night-Time in 2012.