Is your Thomas MALLER from across the Severn - Bisley ?

if so then he signs up just after the end of the 2nd Boer war

British Army WWI Pension Records 1914-1920

Name: Thomas William Maller
Estimated Birth Year: abt 1883
Age at enlistment: 20
Birth Parish: Bisley
Birth County: Blancester
Document Year: 1903
Regimental number: 18660
Number of Images: 4