Hi, I am sorry if I failed to respond to Ian M's and royoftherovers's question, forgive me I am new to the Club.
My car had done 125000 miles with virtually a full Lexus service history.
It is interesting that Lexus's quote for replacing Ian's water pump was only £395 whereas my cost was based on 11 hours labour. I also note that his is a 2012 model against my 2009. I asume that a major modification took place. I was assured by the Aftersales Manager that that was the time allowed and I spoke to the technician who did the job who confirmed to me that that was how long it took. I had also checked with other dealerships and an independent Lexus engineer. Lexus Bolton were very helpful in their hourly rate and also by applying what is known as Mechanical Loss Avoidance [MLA] which is a scheme within Lexus designed to reduce running costs for older vehicles.
It is ironic that royoftherovers suggests taking the case to the County Court as that, together with the Crown Court, is where I spent my working life. Hard as it is to accept, where there is a disclaimer available to the warranty company in respect of "wear" [and tear] and the cause of the problem was a "worn" bearing I did not feel that I would have had success in any claim to the court.