Most of the major marque clubs offer that but there will usually be a fee, and it will very likely involve an inspection of some description - not so much an MOT type inspection but more an inspection of documents and other evidence that proves the vehicle is what it purports itself to be.
I suppose this is to stop people importing high-value cars thinly disguised as farming equipment etc.
Also, in the classic car world there are unscrupulous crooks that try to pass off replica cars as "barn-find" originals. (I think there are now more type 35 Bugattis than were originally built!)
It does happen - a friend of mine recently bought a Riley Brooklands only to find out that its a fake.
I think you will have to approach the FIAT Club GB as has already been mentioned, I might be wrong but I don't think anyone from a forum would have the right 'clout' with DVLA on this matter