I am also researching my ancestors in Norfolk (Tibenham, Bunwell, Attleborogh area). I notice you mentioned John is the same John bp 1798 in Tibenham base son of Sarah and husband of Eliz Potter? Although I am not directly related I have some other information about this familyand have been in contact with others who are related. If this is any help please get intouch. I would also be interested in any other informationthat you may have re Leveretts in Norfolk.