I have a confession to make. I have never prepared a Xmas dinner. I prefer cheese to chocolate. I only own a couple of pairs of shoes. My shopping trips consist of darting into a store to buy the item I’ve previously identified online.  No, I am not a man. But at this time of year I have much in common with men. You see I am difficult to buy for.  Let me re-phrase that. I am difficult to sell to. Advertising used to be about how many people you...