Thanks very much for your reply, and for the effort you obviously put in to it.
I have visited the Noble/Trotter website before. I believe I am related to the family who maintain it through my great grandmother. I have actually yet to get in contact with them, but I am planning to launch my own site early next year and will contact them before then. Thank you for reminding me!
I will definately get in touch with David also - I think I may have tried to contact him before, unsuccessfully - perhaps at an old emial address. Thanks to you, I know know where to find him.