Thanks for the offer. At the moment we're concentrating on direct line only, and even that is expanding so much that it is difficult to keep track! It would be interesting to know at what points our lines divide.
To reciprocate, I've contacted the man with the book, to see whether he can find anything else. If you want the Harrises (Edward Harris married Isabella Tyndall) I'll be happy to pass them across.
I have a tree on OneGreatFamily.com if you're ever on that site, and another on Friends Reunited.
Bill