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