1871 they are under LOOK!;
William Look 28, Ag Lab
Charlotte Look 24
William H Look 3, born Sheffield
Walter Look 1
Now as far as I know there is no Sheffield in Norfolk.
I had looked for a Marriage for William to a Charlotte 18651869ish on FreeBMD in Norfolk with no luck.
There is this one though;
Marriage Reg, Sept 1866, Sheffield, 9c 499
William TUCK/Charlotte NELSON on same page
Then there is this;
Name: Charlotte Nelson
Gender: Female
Baptism Date: 8 Aug 1847
Baptism Place: Swaffham, Norfolk, England
Father: Robert Nelson
Mother: L... Dickerson
FHL Film Number: 1471577
Reference ID: item 3 p 10
1851 Census has a ROBERT Nelson born c 1811 Swafham/Wife Sophia and several Children including a CHARLOTTE age 3 (1848) born Swafham
FreeREG has her Baptism, 8 Aug 1847, St Peter/St Paul, Swaffham, to ROBERT/SOPHIA nee Dickerson.
1861 we have;
Ann Dickerson 86
Rebecca Dickerson 47
Charlotte Nelson 16, Grand/Daughter
Of course you would need a Birth Cert of one of William/Charlotte Tucks Children to confirm her maiden name but looks ok to me

EDIT;
Marriage of Robert NELSON to Sophia DICKENSON, 28 Jun 1829, Swaffham is on FreeREG
www.freereg.org.uk