There is a private tree on ancestry that says he was born Hampstead Middlesex with the same birthday.
So go over the information you know for certain is correct and work back from there.
ADDED
Checked the census for William Endicott born 1802 Moretonhampstead he never married 1851,1861,1871,1881 he is always listed as Unmar.
Unless his wife died before 1841 and he considered himself unmarried.