The X Files star was photographed in the role of Britain’s first female prime minister, sporting a bright blue suit and big Eighties hair.
While The Crown series three has not yet been released, filming is already underway for series four, which will see Anderson join the cast of the hit Netflix show.
Conservative politician Thatcher ran the country between 1979 and 1990 and was nicknamed “The Iron Lady” for her uncompromising politics and leadership style.
“I am so excited to be joining the cast and crew of The Crown and to have the opportunity to portray such a complicated and controversial woman,” Anderson said in a statement when her casting was announced.
She added: “Thatcher was undoubtedly formidable but I am relishing exploring beneath the surface and, dare I say, falling in love with the icon who, whether loved or despised, defined an era.”
Also joining the cast in season four will be Emma Corrin as Princess Diana.
The Crown season three, which begins on Netflix on 17 November, will introduce Olivia Colman as Queen Elizabeth II.
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