A few years ago, a High Court judge was driving home from his golf club after five or six double gin and tonics when he was pulled over by the police and breathalysed. When the machine barely registered an amber light, the police let him go – at which point, he drove back to the club and demanded that the head barman be fired for watering down the drinks. Dodgy barmen have known for years that, after one proper G&T, you can sell people tonic water in a glass lightly rinsed in gin and not only will they not notice the difference, but regular drinkers may still manifest all the effects of
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