@SamH and the other guy who will be looking at the code (can't remember who you are, LOL).
Saw a bug that I'm not sure if it's ever come up. Last night an "internet" friend of mine who didn't know anything about the licensing joined the Silver and Gold server. I believe he joined in the race in the XRT during the grid setup on a race restart (not positive when he joined). He was able to join the race and started. Normal T1 mayheim caused him to pit and rejoin, which then he recieved the "you don't have a license for this car". He was confused as he didn't know about the licensing. He has no points, so I don't think he was ever on the Copper/Bronze servers. We pointed him to license.ukct.net and gave him a brief explaination of the licensing and the other servers. So, he left to hunt the copper/bronze server down.
So, the bug is, if you time it right, you can join the race (silver/gold server) if you don't have any licensing yet. Like I said, I don't know when he joined. I have a replay, but I'm at work right now, er, working, yeah, I'm working..... I'll upload the replay when I get a chance at home this evening (if I remember in my old age....)