Humour and charm are a surprisingly powerful combination as a means of ascent in life.

I have met a number of entrepreneurs who have built fortunes on the back of their wit and general popularity – and not much else. They disarm us with self-deprecation, we enjoy their company – so why wouldn’t we want to do business with them? Of course, it all has to be done well; sycophancy and flat jokes do not weave the same spell.