I have never seen another Thorn in USA. I saw one at a campground in Iceland when I was there, that is the only other Thorn that I have seen, besides the two that I own. I have not been to the UK.
There are two other Thorns with Rohloffs in my community according to a trip log on Crazy Guy on a Bike but I have not seen them.
Rohloff hubs are almost unheard of in USA and they are quite expensive here. In 2014 I think I saved about $500 when I bought mine from an internet seller in Germany instead of buying it from a USA seller. A neighbor is a bike mechanic and works for one of the larger bike shops in my community, he told me that my Rohloff is the only one that he has ever seen.
So, it is a bit of a surprise to see two bidders bidding up the price on a Thorn with a Rohloff.
I considered bidding on a Raven Catalyst a few years ago, no wheels or hubs included, frame and fork plus crankset and a few other parts sold for about $300 with shipping. I would have been able to use my Nomad wheels on it, but I decided that if I had it I would probably never use it so I let it pass. If I had it I would have had to buy a second shifter and EX box to make it easier to swap wheels from frame to frame.
There is no national VAT tax in USA, so prices here are not comparable to UK prices.