The ATM celebrates its 40th anniversary this week. John Shepherd-Barron is the Briton generally credited with installing the first automated teller machine.
He says the idea first came to him in the bathtub.
"It struck me that there must be a way that I can get my own money when I want it," Shepherd-Barron said. "So I thought about it a bit more, and hit on the idea of a chocolate bar dispenser, like the one that used to be on the station platforms."