I really do hope you get the car Paul and it meets your expectations. I have not purchased any of my cars from a Lexus dealer. I travelled to Bristol to purchase my 400h from an independent dealer. I like to take the wife as she has a keen eye for detail, as I tend to just get excited if it looks good! I did see wear and tear issues and missed a couple as well. However, overall I appreciated that the car was 12 years old. I accepted that unless the car was a complete dog, I would not be able to travel back to the dealers easily - so I decided I might have to cover the costs of some extra items that needed doing. I decided to change the tyres as they were grazing due to age. Your situation is different as you are paying, I presume, top dollar from a Lexus dealer.
I must be honest, I would be far more "anxious" if I felt I was paying a very large sum for a vehicle.
Please let us know how you get on. I would presume, hand on heart, that if a main Lexus dealer was selling a 10 year old car, then it would not be a complete wreck - or am I being naive?