I paid £19400 from dealer for 4500 mile GP. Have the exhaust checked for broken centre bracket as mine was blowing within 2 days and needed a new bracket and back box. It is quite a common problem apparently with the
JCW and GP exhausts (they are slightly different). Also check general fit of all panels (they are built in Italy remember!!) and the security of the rain gutters at the back. I glued both of mine back on with Araldite. Paint work is very prone to chips as only 2 coats of paint allegedly, plus usual wheel checks etc. All can be done under warranty and bargain any wheel refurb, tyre changes etc into the price.