Hi Barbara,
FindMyPast have an Army Record for an Edward Fisher (no John ...) born 1880 in Westminster London, occupation is builders labourer.
He's attesting in 1899 with the Middlesex Regiment.
Unfortunately, no parents or next of kin given, but he gives his address as 23 Vincent Street, Vincent Square, Westminster. His last employer was a Mr Garner of Vauxhall Bridge Road
The only other information is that he had a ring tattooed on the back of his left hand, and that hand had a slight deformity which did not impair its use.
I've looked at the 1901 census for the Westminster address, but no Fisher family living there.
Yorkslass