Thanks Jim, interesting stuff. Do you have any pics of Canadian camps?
A lot of the pre-1943 Italian camps in Britain were built by the prisoners themselves, and the shortage of skilled labour needed to build them led to even more prisoners being shipped from North Africa, which led to more camps being needed......
The German you're referring to was Oberleutnant Franz von Werra, and a film called
The One who got away (I think starring Hardy Kruger) was made of the book in the '50s.