[autoavia]

The story I heard was that there was no specific colour. One of the mechanics was quoted as saying we just mixed silver and green until it looked about right so unless they were painted from the same pot of paint mix no two cars were ever exactly the same colour. 

 You can either match something from Halfords or if you prefer from Tamiya sprays to a photo or you could try the paints4u website.
It rings a bell that the DP214 and DP215 were a lighter green than the DB4 Zagatos but I could be wrong. 

 Also found this which might help or might muddy the waters even more

http://paintref.com/cgi-bin/colorcodedis...gncl=Green