Okay, is this them, might have missed some:
Arthur Buck, 40, b. Norfolk (Arthur Edward, maybe died in Staines in 1922 aged 60).
Mary, 35 (Mary Ethel Johnson, m. 1883?)
Gertrude, 12 (Gertrude Louisa)
Ethel, 10 (Ethel Lucy, may have married in Staines in 1917)
Henry, 8 (Henry William)
Agnes, 7 (Agnes Lydia)
Arthur, 5, (Arthur Sidney)
Elsie, 3 (Elsie Evelyn - maybe died 1915 in Hackney?)
Frederick, 1 (Frederick Charles - maybe married 1919 in Staines?)
Now, Ethel Lucy Buck m. Virgil H. Hoare, and there is a son Thomas A. b. 1917 on freebmd, but only one child, so I went looking for them:
BC bmds:
http://search.bcarchives.gov.bc.ca/sn-19A3250/gbsearch/Births,Marriages,DeathsVirgil Hanson Hoare, d. 1971 aged 83 (Coquitlam)
Ethel Lucy Hoare, d. 1977 aged 86 (Abbotsford)
possible son Thomas Arthur Hoare, d. 1986 aged 68 (Hope)
Could Ethel Lucy Hoare nee Buck be your 'Dolly'?