Thank you very much for all the replies and information, gave me plenty of interesting reading this morning, clearly a very active and friendly forum particularly when you consider how few owners there are compared to other makes.
I like the sound of the TVD dialling out any understeer, I have a car now with a good front end on it and might find that a real frustration. But need to have a go in a non-TVD car to see whether it's an issue or not.
The Stoke car has disappeared off the Lexus website and AT so assume it's sold already. But Charlie I'll get in touch because Stoke isn't too far from where I work in Lichfield so if you can help source a car that could be ideal. My car is in for replacement windscreen then MOT this week so need to sort that first anyway.
I will have more questions as I start to look at individual cars, and I'm sure I'll want to upgrade the exhaust as I have the Porsche Sports Exhaust on my current car which sounds great and is loud in a car with minimal insulation compared to an RCF. I had a test drive in a C63 and thought that was quiet with all the windows up so am expecting the RCF to be even more so. Need to do a bit more reading on the various options available.