Tony,
Many thanks for the update on the GS450h.
I hope that you have good service from the E Class. I kept mine. It is nearly 12 years old, done 192,000 miles and still gives over 50 mpg on any journey over 50 miles. It is not a Lexus however and a comparison is worthless as they are "chalk and cheese". Both are good, at what they are good at !
My researches have shown to me that the problem you experienced has been evident on the Prius (as you already knew).What I did not know was that Toyota recalled ALL Prius (in USA, JAPAN and EUROPE) built between 2004 and 2007.The fault was the same as yours. It is self evident that Lexus (Toyota) knew/know, of this and should have acted/should act, accordingly.
The comments made by Adrian are more than pertinent and have my full support and should in my view be endorsed by all Lexus members of this forum.
Lexus` inability to deal appropriately with this matter demands a full explanation from Lexus Corporate UK and Head Office in Japan.
The owners of the best car in the World deserve much better in my view.
Regards
John