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The Duke and Duchess of Cambridge have been to the Himalayan Kingdom which measures progress in rather a different way to the rest of the world. Instead of gross domestic product, a gross national happiness index has been Bhutan's preferred barometer over the past 45 years, calculating the spiritual, physical, social and environmental well-being of the country's citizens. Our correspondent, Peter Hunt, is travelling with the royal couple who arrived in the capital, Thimpu, for their trip. (Photo: Duke and Duchess of Cambridge. Credit: Getty Images.)