Shooter, He doesn't have a direct line but if you call the main AW number 01234 750205 they can put you through to him.
Funnily enough the blue of mine does appear to be very similar to the GTN blue. Last time I parked next to one was at Brookland in 2016 and it was almost indistinguishable on a cloudy day. In the sun however I don't know how the metallic flakes would compare as I have yet to see a GTN in the sun!
Unfortunately paint matching is a dark art, machine matching is probably the only way to go for anything more than a few years old now.
