Even in the pics direct from the link, that green is far too green for a British aircraft (unless the original pics were taken under fluroescent lighting, which would give an overall green colour cast). The correct British Cockpit grey green looks more like a sage green, as used on all British aircraft until post war, when most were re-painted black. With aircraft such as the Firefly, in service until the 1950s, it might be that they were still in service when the colour was again changed to the grey shades, still in use today.