I'm glad Dan (Danneaux) is in the loop on your Thorn for sale now.... I'm sure he can give you the type of data to list
along with your excellent video, and whether you should post some stills photos, or what works best. He will know.
it looks to me like 540L is the frame size, yes, but again, i'm probably the most ignorant person on this forum, so Dan
will know what specs you could list. Best of luck. Research what they sell for on ebay, first, so you know the price
you should be looking for, certainly. Hope you don't have to sell quickly as in emergency, so you can get appropriate
amount. the negative here is massive amounts of bicycle enthusiasts, here, do not know Thorns, but the ones who do,
and if they are in the market, especially if you find someone very close to buying one out of England, would make very motivated
buyers.