thank you for your replies, they had 4 children while in Bristol, Elizabeth, Harriet Cartwright, Cartwright Buckle and John, not all in one church, they then went back to Thomas parish which is Southrop and stayed there.
I have contacted Bristol Record office too, thank you for that advice.
I also kept having Forest of Dean popping into my mind and check that out and there website popped up "Gloucester St Nicholas Marriage 1734-1837" by Mike Bradshaw , transcibed
maybe this is where I or relatives found it???
Leonie