Here in the UK M&S is considered one of the more affluent grocery shops and they like to offer niche and more high end items. All commercial eggs over here are a light brown/tan colour, so anything deeper brown, white or coloured would be considered quite fancy at best, and viewed with suspicion at worst!
When I give my eggs away to neighbours and colleagues, the first time they see them they are always surprised "Oohh, what lovely colours!" to which I smile and nod whilst internally cursing my Charlie for her non-blue eggs![]()
I always liked a bit of M&S sushi.
