A limited edition blend of four whiskies, two of which were blends that spent over two thirds of their maturation in refill Sherry marrying butts (they make up 57.2% and 1.4% of The Circus respectively). A blended grain was also used (26%), which spent over one third of its maturation in its refill Sherry marrying butt, with the final component Compass Box used being a first fill Sherry cask matured Benrinnes single malt (15.4% of the final blend). The whiskies that make up the blended components remain something of a mystery (even to Compass Box themselves), but you can be sure they've been used to create something truly special by John Glaser and his team.