|Date of birth||14 July 1895|
|Place of birth||Murton, County Durham, England|
|Height||5 ft 8 in (1.73 m)|
|Playing position||Wing half / Full back|
|–||City of Leeds Training College|
|–||Honourable Artillery Company|
|–||Duke of Wellington|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Liddell was born in Murton, County Durham. He played football for Yorkshire Amateur and as an amateur for South Shields, then turned professional when he moved to Birmingham in 1920. He spent the whole twelve years of his professional playing career at the club, for whom he made 345 appearances as wing half or fullback in all competitions, and played in the 1931 FA Cup Final. He was described as a powerful defender who read the game well and was positive on the ball.
When manager Leslie Knighton left Birmingham for Chelsea in 1933, Liddell succeeded him. He remained in charge while the club retained their top-flight status, leaving the job at the end of the 1938–39 season when the club were relegated. During his six-year tenure he selected 70 different players for first team duty.
- Matthews, Tony (1995). Birmingham City: A Complete Record. Derby: Breedon Books. ISBN 1-85983-010-2.
- "Blues" News. The Official Programme of Birmingham Football Club, Ltd.. Birmingham F.C. 30 August 1924. p. 4.
- "Club History". Birmingham City F.C. Archived from the original on 23 August 2007.
- "Schools". Winson Green to Brookfields. Ted Rudge. Retrieved 27 February 2013.