Many thanks for the replies so far.
I specifically wanted a car that already had the 60k/6yr £800+ service, which this car has. I still have a hard time getting over Lexus' service costs to be honest, am I over simplistic to think that Lexus just use Toyota parts?
I also specifically looked for an SE-I trim car, because I didnt want to have the air suspension and not too overly bothered about the LED headlamps, but the Mark Levinson would have been welcomed ;)
Its good to hear about the 12v battery NO LONGER being a problem for the RX450h, but I will be probing that a little bit more on my test drive.
I am likely to go for a 24 months extended warranty for £995 along with a service plan which will give me 3 years of trouble free motoring, which i think is not unreasonable. Incidentally they are giving 24 months for the price of 12 right now.
The dealership and the salesman have gone beyond what I call a great service already, as the salesman in question is going to come into work just for my test drive on his day off tomorrow because all the slots are booked for his colleagues! Not to mention the personalised video, which is always a nice touch.
Its great to hear from you guys about your experience, its reassuring to say the least. Its a lot of money for a car this age, but then it is a lot of car and a Lexus!