We've got the extra cars such as the Lancia Delta, Veyron and F1 on the EU playstation store now so I've downloaded and installed the lot, and nothing's happened! Nothing in the car lots, nothing popped up in the garage. The file sizes are only 100k so what is being installed exactly? I figure a car model would be pretty big. So how do I get access to what I've paid for?
Seems like what you're seeing with the 100k is what some of the guys are talking about here. Might be that the cars already exist in your disc and you are paying to unlock them. Which really sux. I had never heard of that before... http://www.tfw2005.com/boards/showthread.php?t=175081&page=7
Best place for you to go would be the Forum for said game on GameFAQs. Considering the title you might get some nutjobs, but someone should answer you.