Just to let you all know, my car went to the dealers on Tuesday where I had an appointment with the West Midlands area manager for lexus. After a test drive and discussion he admitted there was a fault somewhere on the front suspension and decided to replace the whole of the front suspension on both sides. This has hopefully rectified the problem long term, but unfortunately they could not pin point a specific fault.
The dealer in question were Lexus in Worcester who were extremely helpful.
Thanks for all your responses, they proved very helpful. :winky: