The Guardian l Patrick Wintour: Boris Johnson is expected to travel to Tehran this weekend in an effort to win the release of the British-Iranian woman Nazanin Zaghari-Ratcliffe, who has been held in a Tehran jail for nearly two years.

Making his first visit to Tehran as foreign secretary, Johnson will also seek to put UK-Iranian relations on a new footing, pointing to Britain’s strong defence of the Iranian nuclear deal signed in 2015.

Johnson has played down expectations of an immediate breakthrough in the case of Zaghari-Ratcliffe. Progress may depend on his conversations in two days of talks with senior Iranian figures including the foreign minister, Javad Zarif.

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