Hi Alan. Good review. These are beautiful figures ... great relief, so painting should be a breeze. Nice fine details also.
I bought this (!!) kit some years ago in a sale, for a planned airborne jeep, but it has some differences. It is numbered 35.521 as well, but is called "UK para crew for airborne jeep". It has a white label with B&W images ... must be an older version. The big difference is that it has 3 figures.
The two included here are in mines as well ... exactly the same, plus a standing figure. I checked out the Resicast homepage and it appears to be figure 35.523, although its hard to be sure considering the picture quality and size.
Not really important, but maybe interesting.