Stephen Covey, author of Seven Habits Of Highly Effective People, has died at the age of 79. In his lifetime he is believed to have sold some 20 million books. And on the BBC’s Today programme this morning, businessmen Luke Johnson and Mark Constantine revealed that they both read and take inspiration from self-help books. Self-help books, it was pointed out, are an incredibly cheap source of both information and motivation. Quite right. So why not buy yourself a copy of, say, How To Be Happier or Have Great Sex or Get Intimate With Tantric Sex. Where else would you get so much pleasure for just a tenner?