Very sorry to read of that outcome Martin.
Sadly, there appears to be an increasing number of problematic matters being reported and arising with Lexus UK, their Customer Relationships Department,their Dealerships and their vehicles. Many, I am sure are soluable, but in the short to medium term might well reflect in the various statistical analyses which are printed within the National Press.
I think that you ae right to move Dealerships based upon your experience and I`m sure that Memebers of this Forum will have their owen views on Lexus/Listers, Cheltenham.
You are also right in my view to ask Members for their views on suitable alternative Dealerships.
I would meet with the Service Manager at the Dealership of your choice and introduce yourself without revealing your previous relationship with Listers Cheltenham. I would ask him/her, if they offered preferential terms to owners of older vehicles such as yours. I would enter into a 5 years Service Agreement, and a 5 year Warranty Agreement(which they will probably say you won`t need because of RELAX). That way you will make your mark with the New Dalership and hopefully build and maintain a relationship which will avoid such experiences you have had with Listers.Your future motoring costs will be under control and interest and inflation free with the exception of consumable such as Discs etc.
Good luck and I hope that you will keep us all informed of how matters develop.