Hi Ros, thanks for the link. I'll try emailing them to see what they can offer but I doubt if Thomas gave much information away, he seems to have cut himself off from his early life and family. He even gave a false name for his mother in one record in the USA
As for the Davis family, I hesitate to trace them too far. I have tried to make a practice of only going back or forward one generation on these side branches unless there's a special reason. It is very easy to get diverted from the main project down these side alleys

Mike.