A British woman jailed in Iran on accusations of plotting against the country's government is facing a second trial after Boris Johnson publicly contradicted her defence, her family have warned.

Nazanin Zaghari-Ratcliffe was informed she would be tried on charges of "spreading propaganda against the regime" at an unscheduled hearing in front of a Revolutionary Court judge on Saturday, her husband, Richard Ratcliffe, said on Monday.

She was told if found guilty she would face a doubled sentence as a repeat offender.

The fresh charges came days after Mr Johnson told the Foreign Affairs Select Committee that she had been training journalists in Iran when she was arrested, something that she has always denied.