Whitehead is a native of London. Named after Gaeilge folk legend Fionn mac Cumhaill, Whitehead grew up living an artistic environment much due to the fact that his father, Tim Whitehead is an acclaimed British Jazz musician who despite having a law degree from Manchester University, decided to give up being a lawyer to pursue his music career.
My character in HIM is a fairly typical teenager from a broken family. It's a time of life that I remember well - obviously, I'm only 19 - but a lot of stuff happens when you're that age. You have people treating you like a boy but expecting you to behave like a man. The awkwardness is a big one that I identify with. I'm still quite awkward now really.