A shameful UK judgement, in the same poor light as barking mad US trademarks on software, and 'methods' beloved of Apple.
As there are 16.7 billion colors in 24bit color depth, surely they can't have all 10 million (or so) purple ones. Pantone colour matcher out to distinguish Nestle Purple from Cadbury Purple

Perhaps Cadbury should concentrate on driving their business with product development, than Apple Lawyer behavior. The sublime Philadelphia blended with Cadbury's chocolate is a great example here.