Britvic has developed a new series of vending machines that awards those who can prove their intelligence, through a series of tests, with free drinks.

The “smart” vending machine promotes a brand of flavoured spring water called Juicy drench, with touch-screen programmed games that test mental agility, the idea is to reinforce the message that our brains perform best when they are hydrated.

Although this implies that you must have already paid for a Juicy Drench drinks before you can qualify to see if this increases your brain power and therefore have the chance to win your free drink.

Most of the tests are available online and consist of sbasic maths, spot the difference and spatial awareness.

This is the latest in a series of vending machine innovations. It was only last month that a German publishing company Hamburger Automatenverlag adapted old cigarette vending machines to sell books instead of cigarettes in Hamburg.

In Japan Unilever launched vending mahcines that rewarded customers for smiling using face-recognition technology.

The ‘smart’ vending machines will be installed in cities across the UK including London, Manchester, Bristol and Birmingham.