- Trained at Drama Centre, London. He was one of the older members of Group 28, training between 1989 and 1992.
- For his role as Craig in Creep (2004), he stayed in character and didn't socialize with anyone throughout the shoot.
- Although born in London, Sean grew up in Lowestoft, Suffolk. He moved to London to attend drama school.
- Starred in four movies with Michael Fassbender: Wedding Belles (2007), Prometheus (2012), Macbeth (2015), and Trespass Against Us (2016).
- Doesn't smoke.
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