LONDON: London and Tehran reached a deal last summer for the release of detained British-Iranian Nazanin Zaghari-Ratcliffe in exchange for hundreds of millions of dollars, but the agreement fell through at the last minute, MPs have heard.

Zaghari-Ratcliffe has been detained in Iran for more than half a decade, charged with plotting to overthrow the government.

Tulip Siddiq, Zaghari-Ratcliffe’s local MP, told Prime Minister Boris Johnson that she had been informed an agreement with Iran had been reached, urging him to intervene personally to revive it.