Just an update.
Spoke to the service manager at the dealer and he did sound a bit more amenable and is looking at the price but still says obviously that if the friction plate is worn, then it is not warranty. however found out yesterday that the clutch kit (they fit a new slave) is on a 2 week back order so they wont even open it to inspect for 2 weeks . Lads spoke to Ford customer services who will give him a loan car but only if warranty, which they wont know till its on the ramp in 2 weeks time!! Whole point of having a brand new car was to avoid all this crap. Anyhow well known motoring mag is now involved so we will see. I have to say that a 2 week lead time on a clutch on a 16 month old model (his one of the first registered in the UK) seems suspicious if there is no issue with them lasting as cant imagine many cars having over 20k miles at this point and needing a clutch. Now wondering if the clutch slips under the short factory programmed over boost leading to premature failure. The point is how the hell would you prove it is a design flaw I gather that others have been complaining so be interested if anyone else on here has the new ST2 and having issues