Known to British audiences as Simon Bellamy on Misfits and later appeared in the hit HBO drama series, Game of Thrones as Ramsay Snow.
He had his breakout film role in Wild Bill (2011).
He co-starred in Resistance (2011) with Michael Sheen.
He began his acting career on the Welsh soap opera, Pobol Y Cwm, and later left to study at the London Academy of Music and Dramatic Art.
He has one older brother named Aled.