Background
Arnold was born in Ashford, Kent.
Arnold was born in Ashford, Kent.
He was educated at The Norton Knatchbull School in Ashford, where he pursued his interests in art and drama in his GCSE choices. Acting Arnold made his professional debut in the fifth and sixth series of the E4 teen drama Skins, playing the keen metalhead Rich Hardbeck. He got the role while at sixth form through the open audition process in London.
In September 2011, he starred in the music video "Death Cloud" by Cloud Control.
Directed by the award-winning Luke Snellin, it was shot in Spain for two days. He appeared in a two-part Independent Television drama called A Mother"s Son, written by Chris Language and first screened on September 2012.
In 2013, he appeared in the British Broadcasting Corporation Three zombie drama In the Flesh, and in the third series of crime drama Vera. He also earned a starring role as Adam in the television series What Remains.
In 2015, he joined the cast of Poldark, a new British Broadcasting Corporation series based on The Poldark Novels.
Arnold landed his first film role in the 2014 western The Salvation, shot in South Africa. In April 2011, Arnold donated a painting of his childhood bear to The Bristol Autism Project, which helps autistic children of Bristol.
Outside of school, he has been involved in several plays with Ashford Youth Theatre and was a member of the National Youth Theatre for two years.