“At the Royal Mail...all the signs are that morale in the company is much better than before,” writes Allan Leighton, the Royal Mail’s chairman, in this latest addition to the management bookshelves. His claim may well be justified.

But the fact that workers at the UK postal service are even now braced to take industrial action suggests that morale is still not all that it might be. A reminder, if the author needed one, that leadership is extremely difficult.