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British Airways will resume direct flights to Iran, making it the first British airline to fly directly from London to Tehran in four years. Maria Oleynik, who is currently in Northern Iran updating the next edition of the Bradt travel guide to Iran, told Carolyn Quinn what elements of the culture to observe and whether visiting Tehran would impact on travels elsewhere in the future. (Photo: The garden of the palace of Golestan in southern Tehran. Credit: Getty Images)