He is a member of Fat Les, a band which also contains Britpop artists Damien Hirst and Blur bassist Alex James. Allen is also closely associated with the band New Order. He co-wrote their first number one single, "World In Motion...", and occasionally performed with them live.
Although he was "Fat Les" in the England World Cup song "Vindaloo" and also in other English patriotic music videos, he is in fact Welsh, as is his brother Kevin. They were both born in Swansea.
He is the father of Lily Allen.