The son of a British woman detained with her husband in Iran has handed in a 70,000-signature petition to Downing Street, calling on the government to do more to free them.
Lindsay and Craig Foreman were taken into custody in January 2025 during a world motorcycle tour.
Later charged with espionage, the couple from East Sussex are now in Tehran's Evin prison. They deny the allegations.
Ms Foreman's son, Joe Bennett, said the pair were trying to stay strong in "one of the worst places in the world".
He was joined at Number 10 by former detainee Anoosheh Ashoori and Richard Ratcliffe, who went on hunger strike twice in a bid to get his wife Nazanin Zaghari-Ratcliffe freed from Iran.
