The thing with production in the Netherlands & Belgium, Clipper only actually produced it's own card stock for the first SW 12 backs and the ESB 45 Backs, everything else was released on imported cardstock from Kenner, Kenner Canada, Palitoy and German General Mills, all of which are identifiable by the Clipper stickers applied to the cards, or at least by the tearing or residue left from attempts to remove these stickers. The name plate was used for the offers but the imported cards are still identifiable as being from the Netherlands or Belgium in the vast majority of cases because of the Clipper stickers or evidence that these stickers where once there.
The thing about the imported Kenner cards in the U.K. is that only the offer cards can be identidied as being from the U.K. by Palitoy stickers, all the others are just standard Kenner cards totally indistinguishable from there U.S. counterparts, so again it is likely that the vast majority of Kenner cards with the nameplate removed did originate from the U.K.
The interesting thing to me is the vast amount of imported Kenner cards which appear to have come from the U.K. because unlike Clipper who only produced two of it's own unique cards, Palitoy was producing it's own unique cards all the way from the SW 12 Back A's right the way through until the ROTJ 65 Back D's and even the Tri-Logo hybrids cards but still must have needed to import card stock from Kenner to meet production demand.

Here's an interesting example of a Klaatu on a Palitoy ROTJ 65 Back with the Clipper wrap around sticker. What makes this particular card interesting is that this came from my friends childhood collection and was bought in the U.K. making it possible that Palitoy or some distributers where importing overstock where ever to meet demand, in this case the Netherlands.

The sixteenth and essentially the last of the Palitoy card, this card features the the same front as the 65 D in the fact it doesn't have the black bar under the ROTJ logo, but the 'ages 4 and up' text has gone back to the multi lingual version like the 65 A, B and C cards. In total, only 6 figures where released on the hybrid card, Both Bespin Security Guards (white and black), Greedo, Hammerhead, Snagglettoth and the Cloud Car Pilot.

Yes it is Rancor, my friends Dad used to mold Falcon's and AT-AT's from his memory (which may be incorrect) I think from a previous thread we found a B-Wing with a U.K. stamp also. Like you say though, production on that scale in one factory would be impossible. Have you seen this video from Youtube, I know it's difficult to really say where the footage came from, but if it is entirely from the U.K. the brief pic you see of the Zuckuss being carded is a 45 C?