Thank you for your replies. The outcome was that I had the replacement battery fitted at Halfords as it was still under warranty with them. It then didn't start and was transported to Lexus Cheltenham. They looked at it and initially said yes it was the starter, but because of the Lpg they were not sure if they could repair it. They then contacted and Lpg coy who advised them and Lexus then said they could do it. In the mean time I contacted Gas and Go who said they could fix it but we're busy for at least a week funnily enough because they are converting and ls430 to gas! When I mentioned to Lexus that I thought I would move the car because their price was too high they sharpened their pencil considerably and almost matched Gas and Go, so I told Lexus to do it. About half an hour later I had a phone call from them saying that they had just started on the job only to find that the battery had not been reconnected correctly by Halfords and that they had left off the starter connection! They put it back on again and off it went. So they only charged me for half an hour. Overall I thought Lexus were excellent. I cannot say the same for Halfords as the episode has cost me a triple journey to collect the car today, numerous phone calls and time, and difficulty managing without the car for a couple of days. In fairness they have said give them a bill and the will consider it. So in fact this excellent car continues to be highly reliable and the moral is be very careful who you let work on it!