1 Minicab. 4 Hidden Cameras. 1 Satnav-obsessed driver. What could possibly go wrong?

Sat navs are turning drivers into zombies who cannot reach their destination without one, a survey has revealed.

Only one in five motorists are unable to get around on their own. And on average we lose 29 hours a year going in the wrong direction.

Worryingly, the survey also found half admit they ‘switch off’ mentally when they do, failing to notice landmarks or signs.

In a hidden-camera prank video released today – the black taxi app mytaxi test the good humour of four busy Londoners.