Looking at the car in the 3.7L advert and the cars in the Morgan ads in Ospreys posting, I bet they are one and the same car!
I agree, it´s probably the Geneva Showcar. I saw it in the metal. It also had a spare wheel. Some say MMC was not sure to make the R-Sport with or without it, so they collected reactions on the fair. BTW the spare wheel was not a 205. It was a 4/4 165 wheel which looks neater than a more protruding 205.