Hello Roger.
I was knocked sideways to stumble upon your message, as I am - "one of the St Dogmaels Gwynnes"! It's not often you read your Grandfather's name mentioned by someone you've never met (ie Benjamin Gwynne) - and I well remember Rachel Anne by the way.
Just to repay the 'shock' element in making contact with long lost relatives, I happen to have photographic evidence of Gwynne Wixon visitng my family at St Dogmaels! and will gladly share scans of same with you. If you're interested, please use my personal email for your next message, so that I can attach various things of interest.
hugh.gwynne@btopenworld.com Pob hwyl,
Hugh