Boris Johnson will urge Iran to free British-Iranian girl Nazanin Zaghari-Ratcliffe from prison when he visits Tehran.
The overseas secretary is anticipated to go back and forth to Iran in the following couple of days.
Ms Zaghari-Ratcliffe has been in prison since April 2016 after being accused of spying. She denies the declare.
Supporters of the 38-year-old say that she lately had a well being review to see if she used to be have compatibility sufficient to stay in jail.