Helena Bonham Carter

Gillian Anderson (Sex Education) will play Britain’s first female Prime Minister, Margaret Thatcher, while Emma Corrin (Pennyworth) will play Princess Diana.

The fourth series is set to cover Thatcher’s term and her relationship with Queen Elizabeth II (Olivia Colman), as well as the courtship between Prince Charles (Josh O’Connor) and Lady Diana Spencer and their wedding in 1981 where she becomes Princess.

Netflix has also released images of Queen Elizabeth II and the Duke of Edinburgh (Tobias Menzies), and Helena Bonham Carter as Princess Margaret.

A short trailer accompanied the announcement, in which Olivia Colman’s Queen Elizabeth II declares: “Something as important as the monarchy simply cannot be allowed to fail.”

The trailer also introduced the characters of Margaret Thatcher and Princess Diana, played by Gillian Anderson and Emma Corrin.

The coming series will follow the arrival of Thatcher as Prime Minister and Diana’s turbulent relationship with Prince Charles (Josh O’Connor).

The series takes place during a rapidly changing Britain that faces a failing financial climate and the rise of political agendas against royalism.

The new trailer opens with The Queen reflecting on her reign and the inner tensions within the Royal family as they endure personal struggles in service of their subjects.