hello again ….. many thanks to all those comments and suggestions....I hope to reply to you all individually as soon as...
I have contacted Peter Cornelius and even got his booklet 'Triumph Models X, Z, Gloria, XO, and XV/1 1930-1934' that offers information and data on all those models which is great because the frame, apart from a few minor details, and the running gear is all the same.
My problem is having engine details for when I do a re-build and not being familiar with Villiers, I need something.
The Villiers book I have isn't much help, I've contacted John Harding, he suggested the same book, and there is virtually nothing available on the 12C. I was hoping that someone might tell me that the basic's of the 12C are the same as another model like maybe the 15C which Triumph had hoped to use on the XV (hence the model number) in the first place.
Anyway, I will follow up all you suggestions in the hope I can find what I'm looking for...…
Thanks again ...Tony