Detained British-Iranian mother Nazanin Zaghari-Ratcliffe has had her passport returned and a British negotiating team is in Tehran, her MP has said.

Mrs 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 Mrs 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 Hojjat Kermani, when asked whether Mrs Zaghari-Ratcliffe will be released, said: “I am hopeful that we will have good news soon.”