I went to Lexus Derby and they said it was the windscreen that is the problem. The service manager there wrote me an invoice for the necessary work and that it was the fault of the badly fitted windscreen. I then took the invoice to Autoglass, and after checking the seal I was very unhappy with the quality of work. I took some pictures and left. The next day i got a phone call from Autoglass saying they think there was nothing wrong with the screen but they will pay the bill, properly fitted windscreen, fuse box and an ECU £1510.00 Merry Christmas Autoglass! My brother in law used to be a windscreen fitter and tells me that on a screen as big as a Lexus there should ALWAYS be two fitters lifting the screen in to the car, and this could be the problem.
A VERY SPECAL THANKS TO FAYE AND EVERYONE A DERBY LEXUS!!!!