Alan,
Currently I have no idea where either of them are or if they are still surviving, it would be rather nice to find them both.
I do know several British Wallis tractors were sold and worked in this part of Lincolnshire, recently an instruction book for one came to light in the Caistor area, I also have photo's of another pulling a binder near Alford. Just amazing how for some reason they all seemed to vanish in their working life.
Malcolm.
Malcolm