
It's always good, and refreshing, to see non-standard projects, Ralf!. Carden-Loyd made a number of such designs in the inter-war years. My guess is, this was -the one I'n the photo- that is, a gift from the British Army to their German cousins, after Dunkirk.
Here's a photo we often see here.

More of their handiwork:

"Get your facts first, and then you can distort them as much as you please"- Mark Twain.