Don't know why they quote 'Sky' - they've done that on Karl's MkXII too. The upper section by this date would be matt black, and below the lower frame, roughly the bottom of the seat, would be the original Cockpit Grey Green, not 'Sky'. The black colour was first introduced on the Typhoon/Tempest later production aircraft, and became the 'standard' cockpit colour post war, until the advent of the greys, as still used today.