Here’s the deal: book a two-hour slot online, go armed with a spirit base (from basics such as brandy to baijiu and similarly bizarre brews), and let the bartenders conjure up bespoke brilliance from their stations behind vintage roulette and blackjack wheels reminiscent of a Prohibition casino. Unlicensed to sell alcohol (but permitted to mix alcoholic drinks, in return for an entry fee of £25 pp), we reckon BYOC (‘bring your own cocktails’) is closer to the real deal than most so-called ‘speakeasies’. This basement outlet also offers solid sustenance in the shape of artisan cheese and charcuterie boards from London’s finest suppliers. With fellow guests encouraged to pool alcoholic resources, expect some very interesting results.