What is the correct expression to wear, I wonder, when you’ve just caught a squirrel in your squirrel trap? Guilt? Pain? Sorrow? Fear at the possibility of a 3 a.m. knock at the door from the boot boys of the RSPCA?

The expression you definitely shouldn’t wear, apparently, is one suggestive that you might have taken any pleasure in poor, sweet, bushy-tailed Mr Nutkin’s death.