My dealer has had a look at the seat, and I lso checked others that were in the showroom, they all have a small hard lump in the squab, about 1/3rd way back from front edge. This definately gets a lot worse afater a few miles, and after an hour or so, is damn uncomfortable. They are having it back next week, to investigate further, and have been told by LEXUS that they should try and identify the problem, and rectify it first, because they are loathe to fork out foir a new seat. The service manger tells me that each seat is 5K ! By that reckoning, the front seats alone make up almost a 1/3rd of the total cost of the car !!