I hope it is a mis understanding and you are not left out of pocket.
FRP 319 was for sale on eBay in August by the same seller with the same advert but with a price of £5,000 instead of £4,000.
FRP 319 hasn't been for sale on any of the Puma forums, eBay, Gumtree, Piston Heads or Auto Trader in the past 3 years apart from his previous advert in August as i have been monitoring and saving the data since 2011.
If you go though his feedback you can see he has sold a few cars on eBay with all good feedback apart from one for a 92 Nissan 200SX turbo, grey, stage 1 200 sx 230bhp (#290156326496).
If everything sorts itself out i would double check the car has an LSD or has paper work to see the fitting of an LSD as FRP 319 wasn't one of the FRP's to have an LSD fitted from the factory as it was a Ford management car originally used by John Wright.