I opened a bottle of Russian Imperial Stout which I won at a Stockport CAMRA do earlier.
Tsar from the Buxton Brewery is more brown than black, despite what the photo below looks like. Most stouts have a coffeeish aftertaste; Tsar has it in spades in the aroma and up front when you take the first sip. It also drinks a lot lighter than its 9.5% strength.
It's quite ironic that a Derbyshire brewery is brewing a Russian Imperial Stout - Thornbridge in Bakewell also brew one - given that strong London porters really broke into the Baltic market in the 1820's after tariffs ended the export of Burton ale to St Petersburg.