Taxi drivers are paid to get us to our destination in a professional manner. Once they’ve done that, why on earth should we give them extra money for that privilege?

There’s a simple reason to tip bar and restaurant staff – they earn a low wage, but we’re also far more likely to see them again. A good tip will ensure good service the next time you see said waiter – but that doesn’t apply with taxi drivers. One black cab is the same as another.

So why do we tip taxi drivers? Answers on a postcard please…