Hi Alex,
It’s a Land Rover build ticket. I found one behind the dash of my Series III, which was made special for the Swiss Market so it had some quirky things listed on it. The previous owner of my 2A gave me a photocopy of the one he found. By some of the specs on yours, this looks like one you got from a Series III (fresh air heater, “detox” engine)?
Inside the driver’s seat of my Dormobile in the springbox I found a piece of yellowing paper with “Martin Walter, Folkestone” on it in a 1960’s font.
-Jeremy