Thanks guys, but the Lexus Dealer could not find the source of the noise! Now that the car is out of warranty, that may change. This noise only occurs when driving at this specific speed and only when the front left is going over a rough or uneven surface. Its like someone juggling a bag of spanners. If the road surface is OK there is no noise. Right front is silent at all times. Not having a manual for the car doesnt help as I cant picture what else is in that area that may be the cause, but its definitely speed related. The wheel and stone potential causes have already been ruled out Im afraid. I should have kept my LS 400 like you guys, bulletproof.