Hi Brad
Thanks for taking the trouble to post the info. I have lots of refs to the Barters in B St M, there certainly was quite a few of them in the area. My rellie in Ynysybwl visited the Devon & Somerset FHS very recently and got us back a bit further, to Sarah Barter b: about 1729, she appears to have had a couple of children, no husband/ father found.
Re: John's father, James, (1807) I don't have him on my tree so haven't established the link. Do you have a GenesReunited sub? If so I can give you access to my tree, you may tie in somewhere, if not, any info on John or James's surrounding relatives my throw up the connection. I'll PM my email address to you.
Cheers
Howard