- Began career as part of the National Music Youth Theatre.
- Sang in the 2004 Eurovision Song Contest as part of the boy band Hyrise.
- Appeared in The Kooks' 2005 music video for "Sofa Song."
- Modeled his accent in Chronicles of Narnia: Prince Caspian after Mandy Patinkin's character Inigo Montoya in The Princess Bride.
- A rose cultivar named 'Prince Caspian' was launched by Barnes in 2008, to raise money for the Great Ormond Street Children's Hospital.
- Has been a patron of Make-A-Wish Foundation UK since 2009.
- 2016, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- Jack Barnes — Brother
- Thomas Barnes — Father
- Tricia Barnes — Mother
- Kingston University, London, England (BA in English Literature, 2004)