I did buy it from a Lexus dealer, and it seems they contract their valeting out to a Polish guy. I explained all of the points I mentioned above, plus the fact that there were loads of tar spots I had to remove. I'm not too bothered about the cleanliness aspect, as I enjoyed cleaning it and sorting these things out. The wheels however are a different matter. The dealership say they will get back to me at the end of the week about resolving it. They assure me they will sort it out and I have no doubt they will. I think they are going to try and recover the cost from the valet.
I don't find the ride too bumpy at all. In fact, I'd say it's far softer than the M3 for my old bones!! I'm just waiting for the buyer to arrive for the M3. He's not seen it yet in the flesh but is on a train from 220 miles away clutching a bank draft!!