1891 Census Query - Suggestions Needed Please

[Alex123]

 

My great grandparents are William (born about 1840 WOS)  and Maria Bullock (born 1865 Blaisdon) (nee Portlock).

In 1861, 1871 and 1881 they can be found either as singles living in the WOS area.

In 1901 they appear in the census for Castle Frome Herefordshire as a family.

I am trying to track their movements between 1881 and 1901. I know that they marry in 1885 in Barnwood and that there children are born in Berkley.

In the 1901 census there is

William Bullock, 41, Ag Lab, born Westbury on Severn
Maria Bullock, 34, born Langham Glopucestershire
Arthur Bullock, 15, Carter on Farm, born Barnwood
Henry Bullock, 13, Carter on Farm, born Barnwood
Beatrice Bullock, 11, born Berkeley
Agnes Bullock, 10, born Berkeley

My problem - I cannot find them anywhere on the 1891 census.

Any suggestions as to how I can find them would be very welcome.

Thank you.

June