The comedian had been slated to return to the BBC period drama as Camilla ‘Chummy’ Browne.
But back in August, she announced that work commitments had forced her to quit.
She tweeted: “It’s with a heavy heart that having shared Chummy's return to CTM, I've not been able to birth (pun) the schedule to make it work.
“Truly sad not to be playing Chummy this year but fans are in for a real treat with Dame Harriet Walter as a new cast member and more besides.”
Hart appeared in the show from its inception, but left at the beginning of season four with her character sent away to take over as matron of a mother and baby unit.
Her last-minute decision forced creator Helen Thomas to rewrite the new season at very short notice.
“We were thrilled when Miranda approached us, and I storylined the series for her, but at relatively short notice she had to withdraw,” she told Radio Times.
WHAT TIME IS CALL THE MIDWIFE ON?
BBC
Miranda Hart has quit Call The Midwife
The biggest storylines on Call the Midwife
Tue, January 17, 2017
Call the Midwife has never shied away from tacking big storylines. Here are some of the important issues the popular period drama has explored.
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The biggest storylines on Call the Midwife
“We were hopeful right up to the end that we could make it work, but we couldn’t.
“I just rewrote the series without Miranda in it, which was sad because we would have loved having her in it.
“She is part of the CTM family. But [this time] it wasn’t meant to be.”
BBC
Chummy married Peter in season one
BBC
Call The Midwife returns tonight
The nurses of Nonntus House return tonight fresh from their adventures in South Africa.
The BBC have teased: “In their absence, Sister Ursula has been running a very tight ship and it is quickly announced that she will remain in charge at Nonnatus House, above Sister Julienne.”
The new season will see the nurses encounter female genital mutilation (FGM), the introduction of the pill and the looming shadow of the Kray twins.
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