Forrest is best known for playing the supporting lead role, Matt, in The Teacher for Channel 5 and George in the BBC One wartime drama World on Fire. His other work includes; Mothering Sunday (Number 9 Films), The Gentlemen (Netflix), Sunrise (23ten) and A Kind of Spark (BBC) Coming up he will appear in The Stolen Girl (Disney+), Tresspasses (Channel 4), No Ordinary Heist (Picture Locked Productions) and Titanic Sinks Tonight (BBC).