Is this available from anywhere ? or is it a case of DIY ?
Other than Armourfend/Venture shield, if you are just looking to prevent chipping on smaller areas then I’d advise buying a roll of ‘helicopter tape’ from your nearest mountain bike shop.
The stuff is immensely impact-resistant as it was developed originally to protect helicopter rotor blade leading edges from damage.
We use it industrially as a protective layer on membrane-type keypads to prevent perforation damage.
Thanks for the reply but I need to find a sheet big enough to replace the existing black rear arch protection, unless it’s available pre cut ?
Cheers Jonnyfox 
You are very welcome 
The Exige S1 black stone chip standard protection for the rear wheel arch is available from DeRoure - about 12 quid each … they have one set on stock …
You’re a star
Just ordered a full decal set, ready for the respray next winter 