Keep getting more and more reports of this, the UK region is pretty solid so there shouldnt be any chance of it being the wrong region. Just make sure you account name is the same as before if your playing on another and use the same PSN on the account your using just to be safe. Theres a member who knows a way around the save block on the original version but I have not seen him around for a while, perhaps could be modified for GOTY. Ill search about.
This sounds like the kind of problem but the Big question is "has anybody else managed to use their existing saves and resave , it lets me load", i did up grade my ps3 to the slimline whilst playing the game but it never had a problem b4 i changed the game, as far as i know i just saved the game over to the new machiine, im pretty sure i have my old ps kicking around whats the crack with psn ive never taken it online