Boris Johnson has called for the release of Nazanin Zaghari-Ratcliffe, a British-Iranian woman imprisoned in Iran on espionage charges, so she can reunite with her family in the UK.

Her husband Richard Ratcliffe, has been told that a new court case against her is set to begin next Sunday.

The Prime Minister expressed his "satisfaction" but added that "her continued confinement remains unacceptable. She must be released permanently so she can return to her family, and will continue to do whatever necessary."

Since released from prison in March, the charity worker has been under house arrest in Tehran. She has repeatedly rejected the accusations against her.

“Iran continued to make her and her family undergo an unbearable ordeal," Foreign Secretary Dominic Raab said earlier.

Due to the coronavirus pandemic, Mrs. Zaghari-Ratcliffe, aged 42, had been out of jail but had been confined to her parents' home. Her sentence expires on Sunday.

She was detained in April 2016 while on her way to visit her parents in Iran with her six-year-old British-born daughter Gabriella.

She received a five-year sentence for allegedly attempting to overthrow the Iranian government, which she strongly denies. Her British passport has not been returned to her yet.

Ms. Siddiq told the BBC:  “She will have to go back to court and we don't know what awaits her there.”

"Nazanin is worried because there is another case being put against her which may mean another sentence, and for an unpredictable period."

Ms. Siddiq further says that the removal of her ankle tag allowed her to visit her elderly grandmother.

"On one hand, they're happy that she has some freedom for now, but we are uncertain about the court case. Her daughter has been counting days before her mother returns home."

Jeremy Hunt, who served as foreign secretary while Mrs. Zaghari-Ratcliffe was in jail states, it's completely inhumane because at the heart of it is an innocent woman, her husband, and her daughter. He told the BBC, that Mrs. Zaghari-Ratcliffe should be allowed to return to the UK.

“She was used as a bargaining chip in the game of politics," foreign secretary Lisa Nandy says.

Liberal Democrat's spokeswoman for foreign affairs, Layla Moran says, if the Iranian authorities do not do the right thing, strong words must be backed up by threats of real action.

Antonio Zappulla, chief executive of the Thomson Reuters Foundation further adds, “Nazanin should be granted permanent freedom and escape from this heinous crime against justice.

According to Kate Allen, director of Amnesty International UK, "It is another indication of the Iranian authorities’ brutality. This won't be over until Nazanin has her passport and is on a flight going back home”. She urges the government to take "strong diplomatic action."

Nazanin was convicted after an unjust trial. This baseless new allegation and potential trial are simply intended to postpone her release and put more pressure on Nazanin and her family.

Mrs. Zaghari-Ratcliffe was sentenced to eight months of solitary confinement, blindfolded interrogations, and hunger strikes in order to demand medical attention.

She lived in London with her husband and child before her arrest. In November, she was charged with spreading lies against the Iranian regime for the second time.

Her family and the UK government have always asserted her innocence. The Foreign Office has granted her diplomatic immunity, implying that the case should be handled as a formal conflict between the UK and Iran. Mr. Ratcliffe claims that his wife and other dual nationals are being kept hostage because Iran wants the UK to settle an age-old debt related to an unfulfilled arms deal.