Richard Ratcliffe, husband of Iranian detainee Nazanin Zaghari-Ratcliffe, has been on a hunger strike in Whitehall since October 24, demanding that the government do more to secure her release.
Ms Zaghari-Ratcliffe, a dual British-Iranian national, was first imprisoned in Tehran in 2016 on espionage charges, which she has consistently denied.
BBC video journalist Lorna Acquah has been visiting Ratcliffe to talk about the physical and emotional cost of the hunger strike and its impact on her seven-year-old daughter.
It comes as Iran’s Deputy Foreign Minister Bagheri Kani is scheduled to hold talks with officials at the Foreign Ministry in London.
Ratcliffe, who will later meet Foreign Minister James Cleverly, told BBC Radio 4’s Today show: “I guess I’m looking for some kind of breakthrough.”
Filmed and edited by Lorna Acquah
Photography: Sarah Gharib