Aged 21 years Diageo's 2013 limited release this is a delicate yet complex whisky. Fewer than 6,000 natural cask strength bottles of this classic Speyside malt from the lush valley of the River Spey are released. 

Cardhu is the Speyside home of Johnnie Walker, and the distillery contributes much of its production to the world-famous blend. So much so in fact that the Cardhu brand was turned into a vatted "pure malt" for a brief period in 2002 to ease pressure on its stock, but quickly reverted back to a single malt in 2004 following widespread criticism. The incident saw the rewriting of the rulebook for single malt whisky, and the birth of the term "blended malt," adding some infamy to the Cardhu history books in the process.