I don't think this can be the same man. He left Trowbridge sometime in between January 1813 (his baptism) and August 1826 (his marriage). He was married to Rachel Kelly in Plumstead, Kent and they lived in the Plumstead/Woolwich area for the rest of their lives. They had 8 children.
I don't really know anything about his ancestors but presumably he may have been related to William Carrier, the Chartist. I suppose it depends on how many Carrier families there were in Trowbridge at the time.
Thanks very much for this info. as I hadn't known about William Carrier, the Chartist before.
Slipper