Hello Bad Bill,
Your post has really excited me, I had no idea about any of this and would have continued not to have had it not been for your wonderful information, I will certainly search out the book you mention, and having a father and husband who are both very interested in motorbikes this will be of great interest to them too.
I also didn't know that they had had children so thanks for that information too. I am related to Edith Clara Wilson through my dad's line, she was his grandfathers sister. I don't know a deal about this family apart from the information already listed above, and I never discovered the death dates for either Clara or William, so a link to living relatives who may have these answers would be invaluable and if you could sort this out I would be eternally grateful.
Many, many thanks for taking the trouble to get in touch with me, You have given me a wealth of information to go on.
All the best,
Sue