“Britvic has installed vending machines across the UK which dispenses free drinks to those who can prove their intelligence via a series of tests

The “smart” vending machines, which promote a brand of flavoured spring water called Juicy Drench, have touch-screens programmed with games that test mental agility. The idea is to reinforce the message that our brains perform best when they are hydrated.

Although presumably that means that you need to have drunk a Juicy Drench before playing in order to then win a free drink.

Most of the tests — which you can try out online — are a matter of simple maths, spot the difference, or spatial awareness. The vending machines will be installed in UK cities including London, Manchester, Bristol and Birmingham this month