The MP of the British woman jailed in Iran has said that her life has been endangered by the comments of the foreign secretary Boris Johnson.

Nazanin Zaghrai-Ratcliffe, who denies claims by Iran where she is jailed of trying to overthrow the regime, is reportedly on the brink of a nervous breakdown and has consulted a doctor after finding lumps in her breasts, according to her husband Richard Ratcliffe.

But MP for Hampstead- Kilburn Tulip Siddiq said comments by Johnson that Zaghari-Ratcliffe was "simply teaching people journalism" in Iran, instead of being on a holiday as she insists, have endangered her life.

Siddiq told Sky News that Zaghari-Ratcliffe was "inconsolable" and "sobbing down the phone" and "couldn't believe" that the foreign secretary could make comments that would endanger her life".

"This is not something you can dismiss as a joke, a gaffe, a blunder..this is life or death. If the foreign secretary, because of his words, Nazanine gets even one extra day in jail, then this is when he needs to realise he needs to resign and go because he is unfit for office," she told the broadcaster.

The foreign secretary had told MPs that he had called Iran's foreign minister to clarify that his comments about her case were "not misrepresented".

Johnson also spoke by phone with Zaghari-Ratcliffe's husband, Richard Ratcliffe, who himself said he did not think the foreign secretary should quit because he had a "crucial role" in fighting for his wife.

Meanwhile Environment Secretary Michael Gove told the BBC he would "take her husband's assurance" that she was on holiday.

Her family said that she had been given a mammogram by the prison's gynaecologist and was given pain relief medication and vitamin pills pending another examination next week.

Nazanin Zaghari-Ratcliffe has five-year prison sentence upheld
Gabriella (L), Richard Ratcliffe, Nazanin Zaghari-Ratcliffe Family handout