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Iran and world powers including the US have reached a landmark deal that will ease economic sanctions on Iran and in return limit Iranian nuclear activity. We speak to Tehran-born businessman Xanyar Kamangar who tells us that Iran is a ripe consumer market that investors are already eyeing up. We also speak to journalist Barbara Slavin who explains the wider geo-political significance of this deal and whether this really is a turning point for US-Iranian relations. Plus, the much-anticipated new novel by Harper Lee, Go Set a Watchman, has gone on sale around the world. The book is set 20 years after the events of Lee's 1960 Pulitzer Prize-winning novel To Kill a Mockingbird. Many bookshops remained open all night to cope with demand - our reporter Vincent Dowd meets some of the fans that spent hours queing so they could get their hands on a copy of the book