During the 1952–53 Northern Rugby Football League season Llewellyn played on the wing in St. Helens' 5–22 defeat by Leigh in the 1952 Lancashire Cup Final at Station Road, Swinton on Saturday 29 November 1952.
During the 1952–53 Northern Rugby Football League season Llewellyn played on the wing and scored a try in St. Helens' 10–15 defeat by Huddersfield in the 1953 Challenge Cup Final at Wembley Stadium, London on Saturday 25 April 1953.
[4] During the 1953–54 Northern Rugby Football League season, he played on the wing in the 16–8 victory over Wigan in the 1953 Lancashire Cup Final at Station Road, Swinton on Saturday 24 October 1953.
During the 1956–57 Northern Rugby Football League season, he and played on the wing in the 3–10 defeat by Oldham in the 1956 Lancashire Cup Final at Central Park, Wigan on Saturday 20 October 1956.
In retirement, he stayed in St. Helen's, working as an English language and PE teacher, and later became deputy head at two local secondary schools.