Hi Barry.
As a matter of interest, my own Tilly was the one used by Tamiya for their latest 1/35th scale model.
Since more surviving Austin Tilly's are in Malta than the rest of the world put together. And since there is a fellow owner and historian there, who I know would not mind helping with any information/pictures he has. I suggest you contact him and mention my name.
He is
Clive Sammut
Regards Ron Pier