Callum was born in London and grew up on a Chelsea estate - he is a huge Chelsea football fan - where, he claimed in a 2014 interview, "I learned more from films than I did through life itself." Six foot two tall, he decided to go into acting at age eighteen taking some courses and working as a model for Burberry, fronting their 2011 campaign photographed by Mario Testino. Whilst continuing to take acting lessons he was cast by John Boorman to play the director's younger self in 'Queen and Country', the sequel to 'Hope
