Just by way of update, I got my car yesterday (in the rain), but the sun came out this morning for a few photos.
So far, quite happy, lots to learn about how all the toys work and that manual is certainly a thick book. The only disappointment is the sat-nav: the Audi system was very intuitive easy to use whereas this is much more reminiscent of the archaic system in my old IS, which is a bit of a surprise. But I guess I will get used to it.
On the positive side, it's had 2 new Dunlop SportMaxx A1 tyres fitted on the front since I viewed the car (during the negotiation, I had agreed with the salesman that although they were worn, they were quite adequate and I would replace them myself in due course, but apparently, their condition failed the Lexus preparation standard so they had to be replaced) and it's got a 12 month MOT in place of the expected shorter one.
Once the RX gets my personal plate on it, you'll never know it's a 4.5 year old car
As you can see, the drive is now a Toyota/Lexus zone again.