Mis-filed (& indexed as Charles Arthur SCOTT) in the WW1 Service Records (WO 363):

Charles Alfred PARKER, son of Jesse William, home address Kaye Street Wakefield (Yorks). Trade: Factory Lad.
Enlisted November 1916, declared age 18yr 6m. Discharged 1919.
Regt No 39020 (Yorks & Lancs).

Anc****y, SCO, 58916 to 58939