This subject has been discussed before and there is no paint code for this colour. I've recently repainted my car in the traditional AC "Princess Blue" or US "Viking Blue", a paler more silvery colour. Only way to match it was to print off photos of cars, go to an auto paint specialist and get them to match it . Most can scan a colour and reproduce it. Get several samples and try them.
I was fortunate to have found an AC colour sample guide on Google Images also.
Don't be too critical, if you got every home build replica painted in this colour, they'd all be different.
