[2] He studied at the Royal Academy of Dramatic Art[3] for two years, before leaving to pursue a career in music with the band Mover.

[2] Hazeldine returned to acting ten years later in 2003, when he made his professional debut as D.C. David Butcher in Prime Suspect 6.

[1] In 2014, he had a recurring role as George Sewell in the British period crime drama television series Peaky Blinders, alongside Cillian Murphy and Tom Hardy.

[1] In 2018, Hazeldine took on a main role playing John McDaniel in the British supernatural television series The Innocents, alongside Guy Pearce.

[1] That same year he appeared in Ridley Scott's The Last Duel, in a cast which included Jodie Comer, Matt Damon, Ben Affleck, and Adam Driver.