For most of its existence Caol Ila has been Diageo's quiet workhorse on the north coast of Islay, distilling vast quantities of peated malt for the Johnnie Walker blend out of its 1972-rebuilt stillhouse above the Sound of Islay. Less widely known is that since the early 1990s the distillery has set aside a few weeks each year to run unpeated barley through the same six stills — a habit originally intended to give the blenders a lighter Islay note to play with.
The 15 Year Old Unpeated Special Release, part of Diageo's annual autumn lineup, is one of the most celebrated bottlings to come from that unpeated production. Distilled in the early 2000s and matured in refill American oak hogsheads, it was bottled at a natural cask strength of 60.39% ABV — a fearsome number that nonetheless carries itself with the same long, lean elegance you find in standard peated Caol Ila.
Strip the smoke away and what remains is a remarkably austere spirit: lemon, hay, shortbread, a flinty mineral edge that hints at the cold seawater drawn through the distillery's condensers. There's none of the sherry richness of the older Special Releases here, just refill oak letting the distillate speak in plain terms.
It is, in some ways, an academic dram — a chance to hear the engine without the exhaust. But it is also genuinely beautiful in the glass, and a reminder that Caol Ila's reputation rests on more than peat alone. A collector's curiosity that drinks far better than its rarity might suggest.
