There's a bit of a dilemma here... PaulC is right, the Azure Blue S4s at UKSC (reg UDZ **** if memory serves correctly) IS an ex-forum users car. He had to get rid of it quickly cos of redundancy or divorce or something and was/is totally gutted to have got rid of it. It is a truely sorted and spot on car which, in theory, should survive the UKSC tampering but it is horrendously overpriced and you would only get a very short warranty which isn't worth the paper its written on. So if you go into it with the view of a private purchase (providing the price is right) with no comeback if things do go wrong then you'll get a VERY nice car.
Of course, I'm not at all biased about the colour