You're from Lowestoft? Where in the world is Lowestoft? Just asking. I don't know what you're asking for. Are you hoping for more dirt, brake dust, and lock up? Or are you looking for GT merchandise? Reading a title like "Getting Late," I don't really know what all this is about. But I'll try my best to solve as many issues as possible.
Getting dust and such would probably be tough to animate or implement, but it would be the equivalent of sliding into oil on the track. Just something to blow your balance on the track. Or if GT wants to investigate keeping the engine cool and not overheat, the moment your car gets real dirty, it can mean all hell can break loose for your car. Brake dust is noticable in pit stops from what I've seen. PD would have to investigate almost EVERY ASPECT of a race course from the grass, to puddles after rain, marbles on the race track, and all that when it comes to racing a track. So I don't think it's too possible.
As far as merchandise goes, I guess you'll have to be creative. I don't really know how you can cash in on GT gear except for official goods. I don't know of anyone offering GT merchandise.
That's all, good day.