Hello Colin,
I've had a look at the 1891 census, as it's the nearest year to when William Lee and Florence Smiter may still be with their parents.
I found a possible William Lee, but there is no middle name of Herbert.
Florence Smiter was easier - more unusual name.
The reference is RG12/1502 Folio 28 Page 16
living at 43 Tottenham Street, Great Yarmouth.
SMITER, James W Head Married M 42 1849 Plumber 
 SMITER, Mary A Wife Married F 39 1852 Silk Weaver 
 SMITER, James H Son Single M 18 1873 Iron Founders Labourer 
 SMITER, William Son Single M 17 1874 Barman 
 SMITER, Florence Daughter Single F 15 1876 Silk Winder 
 SMITER, Ernest Son M 12 1879 Scholar 
 SMITER, Albert Son M 10 1881 Scholar 
 SMITER, Percy Son M 9 1882 Scholar 
 SMITER, Arthur Son M 6 1885 Scholar 
 SMITER, Frank Son M 4 1887 
 SMITER, Gertrude Daughter F 1 1890 
All born Great Yarmouth.
If this is your Florence, there's a marriage entry for her parents on Freereg
http://www.freereg.org.uk/cgi/SearchResults.pl?RecordType=Marriages&RecordID=545494It gives a lot of detail, which will help, I hope.
Yorkslass