"Well," says Glyn, "when you handle as much money as I do in a day, you get the 'feel' of it. If you doubt me, take it to a bank and let them examine it."
His customer said: "I'll take it to Sainsbury's, they'll accept it."
"Of course, they will," he replied, "because their staff haven't got a clue, neither do they care it's not their business."
It's a good point.