There is a marriage in 1900 in Deptford of Alfred William Sheen, 21, father John Henry Sheen (deceased), Decorator. Spouse Louisa Elizabeth Jackson, father John William Jackson, Bricklayer.
They might be in Deptford in 1901, in the same house as her parents.
piece 524 folio 82 page 18
https://www.familysearch.org/ark:/61903/1:1:X98K-YLGBirth?
March 1878 Greenwich 1d 979
Sheen, Alfred William
Need to find him in the new index!
In 1881 in Lewisham there is
Henry Sheen 35 Paperhanger
Elinor Sheen 36
children including
Henry Sheen 15
Alfred Sheen 4
https://www.familysearch.org/ark:/61903/1:1:Q277-ZRGXAll born Greenwich except youngest Florence, 1, born Lewisham (mother Saweard)
SHEEN, HENRY JOHN
Mother's Maiden Surname: SAWEARD
GRO Reference: 1868 S Quarter in GREENWICH Volume 01D Page 754
Henry junior seems to have joined the Army Service Corps in August 1889.
Age 21, Painter, born Greenwich.
But says he is not married, next of kin are parents Henry and Ellen.
The record goes up to 1892, then says Recalled to Army Service, but I can't read any more.
Is in the WO363 burnt records for WW1, but also in WO97 (don't have access, presumably much the same?)
Meanwhile, the rest of family in Lewisham in 1891, as Sheer.
Head of family Henry is a House Decorator
https://www.familysearch.org/ark:/61903/1:1:Q32F-CT2Could HJ have married as JH and run away from Gertrude not long after?
Better suggestions welcome!