Hi,
Thanks for your input. I have now emailed the local Lexus Dealer asking questions, also incorporating the points you raised. When I first purchased the car in 2016 my garage, who look after my other cars, advised me of 'more than the normal' amount rust around and behind the front suspension and suggested that the car had been in some water at some stage, for example driving regularly through a ford or a flood. Of course I have no knowledge of this and have since had the car professionally waxoiled. I will keep you advised of progress