There was a lengthy conversation on JPS Europas on the Yahoo group several years ago. If you're not a member already, it's free to join and you can search old posts. I think there was a discussion about the JPS here, also. I thought there was also some information about JPS Europas at lotus-europa.com but I wasn't able to find it right away.
Joji is right that the JPS was denoted by the dash plaque. The sticker on the B-pillar was occasionally applied to non-JPS Europas at the dealer. I had thought that they were always applied to JPSs, but I am obviously mistaken. r.d. enterprises used to have them if you want them for your car. Ray made copies from a sticker I had gotten from the distributor in New Orleans when my car was 'new'. Unfortunately, from what I heard,they didn't sell well.