Boris Johnson will raise the case of a British mother jailed in Iran when he travels to the country this weekend - his first trip there as Foreign Secretary.
The dual British-Iranian national from north London was sentenced to five years in prison in the country in 2016, over allegations of plotting to overthrow the Iranian government - charges she denies.
Mrs Zaghari-Ratcliffe was arrested during a family holiday, a trip in which the 38-year-old was taking her baby daughter Gabriella to meet her parents.
She is due to face fresh charges of "spreading propaganda" during a court appearance on Sunday.
Mr Johnson has been under intense pressure to act to secure Ms Zaghari-Ratcliffe's release.
The Foreign Secretary was widely criticised after incorrectly telling a parliamentary committee that she had been training journalists in Iran, later acknowledging that this was not the case.
Ms Zaghari-Ratcliffe's husband, Richard, had urged Mr Johnson to take him to Iran, but Sky News understands Mr Ratcliffe will not be going.
Mr Johnson's trip to Iran will be the first visit by a British foreign secretary since 2015 and only the third since 2003.
Sky's Diplomatic Editor Dominic Waghorn said the visit has been planned for "some time" as part of a bid by London and Tehran to improve relations.
Mr Johnson will meet with his Iranian counterpart, Mohammad Javad Zarif, during the trip.
As well as the case of Mrs Zaghari-Ratcliffe, Iran's nuclear deal with the West is also expected to be on the agenda, an agreement that US President Donald Trump has threatened to scrap.
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