Nobody I know has ever been interviewed by an opinion pollster. Nor do I ever encounter anybody who has won one of those holidays in the Bahamas we are encouraged to enter competitions for every time we open a crisp packet or pull the tab off a soft-drink can. I used to be equally sceptical of claims that bookmakers lost between £15 million and £20 million on 28 September 1996, the day Frankie Dettori rode all seven winners on the Ascot cards.