Harvey's is making the British version of Le Coq Imperial Stout. It is a huge beer, with the classically woody, resinous, tar-like flavors of the style, and made an enormous impact in D.C. It has an original gravity of 1106, and an alcohol content of at least 9.5 per cent by volume (7.6w). The malts are Pale Ale (Maris Otter) and an unusual blend of older, darker styles: amber, brown and black. The hops are Sussex Fuggles and East Kent Goldings. The beer is conditioned for at least 12 months, in closed stainless-steel vessels. During this period, a wild yeast fermentation develops. The yeast is of a strain called Debaromyces hansenii, catalogued in 1924. It is similar to Brettanomyces. Brewer Miles Jenner believes the strain is airborne. The other possibility is that it is an element of the house yeast but, in the manner of Brettanomyces, emerges only in the course of a long maturation.