I would never normally condone a flat shoe, but I guess if the newly wed Duchess of Cambridge, the future Queen herself, she who wore the most stunning McQueen wedding dress should wear them whilst elegantly (of course) pushing a trolley, then why shouldn't you girls?
These cute little pumps are by French Sole (stores around London and online), and cost £98. With a mock-croc patent finish, they're fit for any Princess!