Hi Tom:
This is a long shot

I have still been looking in the 1891 UK census - and I've been trying all sorts of name combinations. This is probably not right, but I found this family in 1891 and have not been able to find them in the 1901 Census. So I wonder if this Manley family are John / Jessie / Herbert in 1891:
1891 Census - RG12 / 3714 / 122 / 24
John Manley - H - M - 41 - born 1850 - Insurance Secretary - St Pancras, Middlesex
Jessie Manley - Wife - M - 24 - born 1867 - Sydenham, Surrey
Herbert Manley - Son - 2 - born 1889 - Leeds, Yorkshire.
Its just a thought, but there are some interesting coincidences between the names, dates, Herbert's place of birth, even John's occupation.
Couldn't find a marriage that I thought was right and also couldn't find a birth for Doris.
.....and of course, absolutely no idea why they would emigrate to Canada under the surname Bennett.
sami
....added.....and this may tie in with why Doris, on her marriage licence application, ...... indicates her dad's name is John Manly Bennett.