I've sorted out my paint codes and this is what I've learned. The colour code is on the inner N/S wing and it's the 1st 3 letters that count. Mine was ETMcA. I don't know what cA refers to but ETM is gris axinite.
I went to Halfords where they mixed it up and it looks right although I've yet to apply it. Interestingly, it has so many ingredients that it couldn't be made up in a small enough quantity for the touch up bottle that I wanted so there was some left over which they gave to me in another bottle with a smaller touch up brush for free because they would only have thrown it away. Useful.
So there we have it. I hope that somebody finds this helpful.
John
1973 Dyane
1990 TZD Turbo