Frederick Digby married Emma Preston in 1856.
Marriages Dec 1856 (>99%)
Digby Frederick Downham 4b 984
Preston Emma Downham 4b 984
Easy to find on this free site!http://www.freebmd.org.uk/cgi/search.pl
I have found the marriage registry entry in the Downham registers on the Family Search site here:https://familysearch.org/pal:/MM9.3.1/TH-267-12699-22031-50?...
Her father was Robert Preston a Carpenter.
This Robert is a Carpenter but there is no Emma unless she is Emily. Caroline was a witness at her wedding.
National Archive Reference:
RG number: HO107
Reg. District: Downham
Sub District: Downham
Parish: Downham Market
Address: Lynn Road, Downham Market
Name Relation Sex Age Birth Year Occupation Where Born
PRESTON, Robert M 43 1798 Norfolk
PRESTON, Maria F 42 1799 Norfolk
PRESTON, William M 19 1822 Norfolk
PRESTON, James M 17 1824 Norfolk
PRESTON, Henry M 15 1826 Norfolk
PRESTON, Caroline F 13 1828 Norfolk
PRESTON, Emily F 8 1833 Norfolk
PRESTON, Maria F 6 1835 Norfolk
PRESTON, Robert M 10 1831 Norfolk
PRESTON, Ann F 4 1837 Norfolk
PRESTON, Elizabeth F 1 1840 Norfolk