 Brooks belongs to a family that supports the Labour Party but is himself a Welsh Nationalist.He left Plaid Cymru in the first decade of the 21st century, after being openly critical of Dafydd Elis-Thomas and rejoined ten years later when his friend Leanne Wood became party leader.His book "Pam Na Fu Cymru" (2015) was shortlisted for Wales Book of the Year award in the non-fiction category.