Career
Herdman played at representative level for Wales and club level for Fulham RLFC. He played as a second-row during the era of contested scrums. In 1984, Herdman went to America after being given a tryout as a running back for the Kansas City Chiefs, but was cut from their roster. Herdman has played regular parts in Bramwell, Coronation Street, Family Affairs, Soldier Soldier, and The Bill.