For those mixologists who don’t have deep enough pockets for such high-tech machinery, there are plenty of other, cheaper gadgets which can instantly make a cocktail memorable. The £60 Smoking Gun – which shoots a flavoured smoke over food and drink in seconds – has become ubiquitous, with bars including Opium and The London Cocktail Club among the proud owners. By using different types of wood chips, bartenders can adjust the flavour of the smoke, while the billowing clouds create a little theatre for customers (who doesn't want to order a drink that looks like it's on fire?)