I always thought or was lead to believe it with Shasta white but found it to be slightly on the cream side of white so swerved it and went for traffic white Ral code 9016 as you need the white to contrast against the darker colours as much as possible

Not sure on the red as I had it colour matched and my Blue is the 1980’s Rothmans from Gardners era and also used on the Rothmans Porsche and Metro 6R4
Believe they changed the Blue pantone colour in 1991/92