The dealer was a bit of a fraudster, he said as I was another owner and put about 200 miles on the car the value (rubbish) of the car had gone down Pro Car sales http://www.procarsales.co.uk/.
Rubbish service , feel cheated, fight the full refund battle but will get a replacement Z first
the RAC check is a 317 point check just o mitigate against rust/structure issues like my last Z