Thank you Orielbenfro for responding so promptly. The genuki reference is great - most interesting thank you. I have just looked through the Thomas Williams Will 1800/30, of Tally Parish, CAM (thanks for this ref too). I am not sure if I have the right will here though as I can find no mention of Sarah Williams. Am I missing something?
As to my preference for online sources, I do hope that I can follow up soon with a visit to Camarthen to check out what I can. I am enormously grateful, however, that one can do so much on line as a "first port of call" to get a bit of an idea about the scope of things, prior to making arrangements to trek across the globe to research original sources. That said, however, I greatly appreciate your help in pointing me in these useful directions. Regards, NSWelshwoman