Just how did Lynne Truss’ book about the joys of grammar hit the bestseller list? “The book tells you the rules, but is also full of jokes and anecdotes. ‘It is a sort of celebration of punctuation. You can’t help cheering it on, because it has done such a good job in its humble way.’ She speaks of the delights of the semi-colon with relish. She has listened to ‘the man from the Apostrophe Protection Society’ (yes, it exists) but does not sound like a member of any such group.”