Got there in the end - looking for kids with unusual forenames in the BMD and seeking them on the census revealed:-
1901 - RG13/3432; Folio: 135; Page: 15 - Toxteth Park
172, Aigburth Road
Hemter [sic] Hilson [sic] 50 Head Grocer St Benet?, Cumberland
Esther G Hilson 36 Wife Whitehaven, Cumberland
Marjorie B Hilson* 2 dau Liverpool
Aldra E Hilson 1 dau do
Ellen L Ross 29 Visitor Leicester
*Registered as Margery Beryl .....