Career
A police officer by profession, Warren began refereeing in lower leagues in 1978, and was appointed to the list of assistant referees for the Football League in 1991. He had been an international assistant referee since 1994 when he was selected as an English representative at the Fédération internationale de football association World Cup in France in 1998. He was appointed to the final and ran the line, along with South African Achmat Salie, to the referee, the late Said Belqola.
After assisting in the World Cup Final, Warren graduated to become a Football League referee, leaving the international assistants" list at the end of that year.
He had seven years in the middle before stepping down in 2005. He returned to running the line in the Premier League, and refereed just one match in 2005-2006, the Football Conference North game between Stafford Rangers and Northwich Victoria on 31 December 2005.
He subsequently retired from top-class officiating, as confirmed by his absence from the lists of Football League referees and assistants for season 2007-2008.
