Background: Glenda May Jackson, CBE (born 9 May 1936) is a British actress and former Labour Party politician. As a professional actress from the late 1950s, she spent four years as a member of the Royal Shakespeare Company from 1964, being particularly associated with the work of director Peter Brook. During her film career, she won two Academy Awards for Best Actress: for Women in Love (1970), and A Touch of Class (1973). Other award-winning performances include Alex in the film Sunday Bloody Sunday (1971) and the BBC television serial Elizabeth R (also 1971); for the latter, she received a Primetime Emmy Award.
Context: Jackson's starring role in Ken Russell's film of Women in Love (1969) led to her winning her first Academy Award for Best Actress. Brian McFarlane, the main author of The Encyclopedia of British Film, has written: "Her blazing intelligence, sexual challenge and abrasiveness were at the service of a superbly written role in a film with a passion rare in the annals of British cinema." In the process of gaining funding for The Music Lovers (1970) from United Artists, Russell explained it as "the story of a homosexual who marries a nymphomaniac", the couple being the composer Pyotr Ilyich Tchaikovsky (Richard Chamberlain) and Antonina Miliukova played by Jackson. This film received mixed reviews in the U.S.: the anonymous reviewer in Variety wrote of the two principals "Their performances are more dramatically bombastic than sympathetic, or sometimes even believable". Jackson was initially interested in the role of Sister Jeanne in The Devils (1971), Russell's next film, but turned it down after script rewrites and deciding that she did not wish to play a third neurotic character in a row. In order to play Queen Elizabeth I in the BBC's serial Elizabeth R (1971), Jackson had her head shaved. After the series was shown on PBS in the US, Jackson received two Primetime Emmy Awards for her performance. She also portrayed Queen Elizabeth in the film Mary, Queen of Scots, and gained a BAFTA for her role in John Schlesinger's Sunday Bloody Sunday (both 1971). In that year British exhibitors voted her the 6th most popular star at the British box office, and she appeared in a comedy sketch as Cleopatra for The Morecambe and Wise Show including delivering the line 'All men are fools and what makes them so is having beauty like what I have got.' Filmmaker Melvin Frank saw her comedic potential on the Morecambe and Wise Show and offered her the lead female role in his next project. She gained a second Academy Award for Best Actress for A Touch of Class (1973). She continued to work in the theatre, and returned to the RSC to play the lead role in Ibsen's Hedda Gabler. A later film version directed by Nunn was released as Hedda (1975) for which Jackson was nominated for an Oscar. In 1978, she scored box office success in the United States in the romantic comedy House Calls, which co-starred Walter Matthau. Jackson and Matthau teamed again in the comedy Hopscotch (1980), which was a mild success, but not as popular as expected. For her 1980 appearance on The Muppet Show, she told the producers that she would perform any material they liked; this turned out to be a role where she has a delusion that she is a pirate captain who hijacks the Muppet Theatre as her ship. CANNOTANSWER
Question: When did Jackson begin to see success?. Whats the answer?

Jackson's starring role in Ken Russell's film of Women in Love (1969) led to her winning her first Academy Award for Best Actress.