For those of you that aren’t fans of the BBC’s The Fall (but seriously, how could you not be?!), we’ll forgive you for not previously spotting this new, and somewhat unexpected, hair colour trend. But what is this emerging trend, you ask? Well, it’s brey – AKA blonde/grey. And although this subtle hair hue was pioneered by Gillian Anderson’s character, Superintendent Stella Gibson, it is now taking the Instagram hair world by a storm!