William Henry Court service num 21673

[SI,H]

About 10 years ago I asked about my great uncle William Court who fell on the 28/11/1916 , and you kindly informed me of the circumstances of his death, unfortunately I cannot find him on the 1911 census, and have only located him on the 1901 census, can anyone tell me when he joined up? Address? Was he already in service in 1911 which might explain why he isn’t listed at his family address in 1911 ? Are there any records witch might heip me find out more about him?