The William and Ph*be (Montaque on Ancestry) who are on the 1841 census must be this couple:
William Montague
Marriage Date: 8 Jan 1827
Marriage Place: Wooburn, Buckingham, England
Spouse: Phebe Lacey
......
I'm not certain of her age on the 1841 census. It looks more like 35 than 25 to me. (and rounding up and down,etc.)
Just to check against the 1851 census:
GRO Births:
MONTAGUE, CHARLOTTE AUGUSTA mmn LACEY
1849 M Quarter in ETON BUCKS Volume 06 Page 409
MONTAGUE, SAMUEL mmn LACEY
1844 D Quarter in ETON UNION, BUCKS Volume 06 Page 349
Maureen