Jenny: I couldn't leave this one alone - I'm a bit stubborn I guess. However, I think I might have found your Joney for you, AND, perhaps a twin brother? When I entered Joney KNEAL date: 1769 (+ or - 2 years) I came up with the following:

#109

Joney KNEAL F
Christening: 24 Aug 1770 Lezayre

Father: Thomas KNEAL
Mother: Annie CORLETT

#110

John KNEAL M
christening: 24 Aug 1770 Lezayre

Father: Thomas KNEAL
Mother: Annie CORLETT

Still didn't come up with a birth date, but the christening date sure is logical. Hope this is what you're looking for.