I've just found this thread via Google. My probable gggrandfather is John Vivian, b. Hazelbury Bryan abt 1821. He married in Bath in 1847 and appears to have also lived in Westbury and Abergavenny/Tredegar S Wales if I have ascribed the correct children to him. His usual occupation is Coachman.
I am particularly interested in his daughter Mary Ann, whose birth I am unable to confirm.
If you have any information you are willing to share I would be most grateful.