Source: 18th Battalion Nominal Roll, April 1915.
Find-A-Grave
Family Search: When William Edward Foster was born on 14 August 1869, in Cambridge, Cambridgeshire, England, United Kingdom, his father, Needham Foster, was 16 and his mother, Mary Ann Phillips, was 13. He married Louisa Florence Rumble in 1905, in West Ham, Essex, England, United Kingdom. They were the parents of at least 3 daughters. He lived in Stratford St John, Essex, England, United Kingdom in 1911 and Peterborough, England, United Kingdom in 1920. He registered for military service in 1914. In 1914, at the age of 45, his occupation is listed as labourer.
Enlisted over age.
London Advertiser. March 26, 1915. Page 1.
War Diary of the 18th Battalion CEF 