Thanks for the pointers, I'll study them!
I think the crux of my question is that when you have a baptism, marriage or burial in which the listing states the "parish chapel" as being Westbury on Severn, does this mean the Westbury Church of St Mary, St Peter, and St Paul or a church/chapel within the parish? I'm just trying to get to grips with relatives in the Plump Hill area returning to Westbury "parish chapel" for notable events.
Cheers Fozzy