Detained British-Iranian mother Nazanin Zaghari-Ratcliffe has had her passport returned and a British negotiating team is in Tehran, her MP has said. Zaghari-Ratcliffe has been detained in Iran since her arrest in 2016 on charges of plotting to overthrow the government – allegations she has always denied. A £400 million debt relating to a cancelled order for 1,500 Chieftain tanks dating back to the 1970s had been linked to the continued detention of Zaghari-Ratcliffe and other UK-Iranian dual nationals held in the country. On Tuesday, Hampstead and Kilburn MP Tulip Siddiq tweeted: “I am very pleased to say that Nazanin Zaghari-Ratcliffe has been given her British passport back. She is still at her family home in Tehran. I also understand that there is a British negotiating team in Tehran right now. I will keep posting updates as I get them.” According to her employer, the Thomson Reuters Foundation, her lawyer …