NigelThe blue/light grey is incorrect, it should be a pale green (actually 'silver grey', but it looks green). The blue comes from a prototype held in the IWM, and that may have been a misunderstanding, it's thought that the sliver grey may have aged in the sun or somesuch.
Nevertheless, most recent research—and not that recent actually—indicates that the blue is incorrect.
1 8 February, 11:12