hassan rouhani — who has held the position since 2013. several of the main reformist candidates have been prevented from standing, leaving three hardliners and one moderate in the race. some dissidents have called for a boycott of the polls, but iran's supreme leader, ayatollah ali khamenei, has appealed for a high turnout. the duchess of cambridge is launching a new centre today, aimed at raising awareness of the importance of the first five years of a child's life. the royal foundation centre for early childhood will aim to improve later life by highlighting what can be done in the crucial first years. our royal correspondent, daniela relph, reports. the youngest in society are now the biggest part of the duchess of cambridge's royal work. she says she's learned that the hardest social challenges often begin in the earliest years of childhood. for her, improving the lives of the very young is the social equivalent