Hi

I have had a good search round for Thomas and i can find only one born 1793, is this the same one you already have.
Thomas O'Boldstone
Baptism year 1793
Baptism day 10
Baptism month Feb.
Baptism Place Wimborne St Giles
Dorset
Son of Thomas and Betty

Could be the family started out in Dorset and moved into Wiltshire

Shelagh