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. 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’. With fellow guests encouraged to pool alcoholic resources, expect some very interesting results.