Thanks everyone, contributions appreciated.
I went to see two different ones and ended up going for the lexus approved one. The first other seemed OK, but pushy salesman seemed desperate to get rid. It was also missing a couple of services (the last one being a non-Lexus service). I have paid a bit more than I need have done, but I'm happy with it.
The test drive was like a dream. Can't believe how quiet it was (on all surfaces), so i've no idea what these reviews were on about it being noisy. I also felt very comfortable and relaxed driving it straight away, and it was a pleasure driving it. Again, these "expert" reviews did not at all reflect what I experienced.
I'm picking the car up in a couple of days and, quite simply, can't wait!