John,
Reason I asked is that at some time in late 70's I worked on one still in army service. It might have been a similar chassis produced postwar, but had all the similarities of the airborne lightweight trailers, wheels, axle towhitch, etc. The engine was an Enfield flat twin, air cooled diesel, definitely post war. If this one you have found is a genuine WW2 type, then a good find, I can find very little info on that one except for the blade being 28" diam.
regards, Richard