Richard Ratcliffe says his wife, who has been detained for four years, is being used as a "chess piece".
Read moreUK-Iran relations
Richard Ratcliffe will meet Boris Johnson later to discuss efforts to bring his wife home from Iran.
British-Australian Kylie Moore-Gilbert details her ordeal in letters smuggled from a Tehran prison.
Read moreThe Foreign Office will register its "strong objections" over the arrest of the UK's envoy in Tehran.
Read moreArad Zarei, 17, who recently relocated to Canada, was among the 176 dead, it emerges.
Read moreJames Landale
Diplomatic correspondent
What does the US killing of Qasem Soleimani mean for relations between the UK and Iran?
Read morePM says Qasem Soleimani was a "threat to all our interests" as he prepares to meet key ministers.
Read moreJonathan Beale
Defence Correspondent
Admiral Tony Radakin describes Iran's seizure of a British-flagged tanker in June as "outrageous".
Read moreWhy one mother's personal plight is part of a long and complicated history between Iran and the UK.
Five-year-old Gabriella has promised her jailed mum she will be "brave", dad Richard tells reporters.
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