Hi again
There are 5 William Leppards in the 1851 census for the Bolney and Cowfold area aged 12, 28(2) 37 and 53 - so the following must be who you are looking for:-
HO107/ 1642/ Folio 339/ Page 13 - Gravelies House, Cowfold
LEPPARD John, Head, Marr, 41, Ag Lab, born Bolney
............. Mary A, Wife, Marr, 43, born Cuckfield
............. Caroline, Dau, Unm, 11, scholar, born Ardingly
............. James, son, Unm, 9, Scholar, born Ardingly
............. John, Son, Unm, 6, born Cuckfield
............. William, Brother, Wid, 37, Ag Lab, born Bolney
Altogether, there are some 50 odd Leppards in and around Bolney, Cuckfield, etc
Chris in 1066