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The idea that the number of horses exceeds the number of tanks in the British army is one that has been repeated over a number of years. Sometimes it has been used as a way to suggest that money is wasted on an animal that serves primarily a ceremonial purpose. While sometimes it is used as a way to argue more money needs to be spent on equipment such as tanks. But is it true? And what happens in other countries? Presenter: Tim Harford and Hannah Sander Producer: Charlotte McDonald (image: Members of the King's Troop Royal Horse Artillery at Wellington Barracks in London, England. Credit: Oli Scarff / Getty images)