Mortlach was founded in 1823 and was the first of Dufftown's "Seven Stills" to be licensed. It rose to pre-eminence under George Cowie & Son, who's unique distillation regime produced a famously "meaty" whisky, which was highly prized by blenders. It was for this reason that it was acquired by John Walker & Sons, and so important to them was it that little stock was left available for bottling as a single malt.
Mortlach bottled this release as the official bottle of the Spirit of Speyside Festival 2013. This limited release is a combination of casks hand-picked to represent the 'individual' aspects of Mortlach.
Speyside's whisky festival, the Spirit of Speyside Festival occurs annually and is host to exclusive distillery tours, walks, tastings, auctions and much much more. 
The Flora & Fauna release was the first official distillery bottling, but it was not until 2014 that Mortlach was bottled under its own fully fledged single malt brand.