The Crown casts Rebecca Humphries as Carol Thatcher in season 4

Humphries will appear as Prime Minister Margaret Thatcher's daughter in the hit royal drama

Rebecca Humphries TheCrown

Trigonometry star Rebecca Humphries has been cast as Carol Thatcher in The CrownRadioTimes.com understands.

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Carol is the daughter of former Conservative Prime Minister Margaret Thatcher, who is being played by Gillian Anderson in the upcoming fourth series of the hit Netflix royal drama.

Humphries’ previous credits include roles in mockumentary series Morgana Robinson’s the Agency and ITV2 sitcom Cockroaches, in addition to a guest appearance on Friday Night Dinner.

It is not clear how major a role the character will play in the upcoming season, but Humphries joins an already star-studded cast for the show.

Series four is set to arrive on Netflix in November, covering the events from 1977 up to around 1990, with Netflix’s description reading, “Queen Elizabeth and her family find themselves preoccupied with safeguarding the line of succession by securing an appropriate bride for Prince Charles, who is still unmarried at 3o.

“While Charles’ romance with a young Lady Diana Spencer provides a much-needed fairytale to unite the British people, behind closed doors, the Royal family is becoming increasingly divided.”

For her second and final series, Olivia Colman will play Queen Elizabeth II. Helena Bonham Carter will star as Princess Margaret, Tobias Menzies plays Prince Philip and Josh O’Connor takes on the role of Prince Charles before they pass their roles on to a new cast for the fifth and sixth seasons.

Alongside Anderson and Humphries, newcomers for the new season include Emma Corrin, who will play Princess Diana.

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The cast for the fifth and sixth seasons of the show – the final two series – will include Imelda Staunton (Queen Elizabeth II), Lesley Manville (Princess Margaret), Jonathan Pryce (Prince Philip) and Elizabeth Debicki (Princess Diana).

The Crown season 5 arrives on Netflix in November. Looking for something else to watch? Check out our guide to the best series on Netflix and best movies on Netflix, or visit our TV Guide