'It's alright, ' said the Penguin, in exactly the sort of way that Penguins don't. 'This is the only book you'll ever need to find complete happiness.' Because it's been a bit of a trying time, hasn't it? You now know that your five-year old is better at maths than you. And English. And at not crying during work. And the only way to get through it with a smile has been to buy all the booze and try to remember how to do 'going out'. But don't worry,...