In 1987, Margaret Thatcher, then Prime Minister of the United Kingdom, won her third consecutive general election, solidifying her position as the longest-serving British prime minister of the 20th century. Her government focused on continuing policies of economic liberalization, privatization of state-owned industries, and reducing the power of trade unions. This victory reinforced her leadership style and policies, which were often controversial, but she remained a significant figure in British politics during this period.

In "Margaret Thatcher: The Downing Street Years," it is suggested that Queen Elizabeth II had a complex relationship with Margaret Thatcher. Initially, the Queen respected Thatcher's strong leadership, but over time, their differing views on issues such as the Commonwealth and social policies created tension. The Queen reportedly found Thatcher's approach to politics and her sometimes dismissive attitude towards the monarchy challenging. Despite their differences, both women maintained a formal relationship, reflecting the constitutional nature of the monarchy's role in government.

In the documentary "Margaret Thatcher: The Downing Street Years," it is highlighted that Margaret Thatcher served as Prime Minister of the United Kingdom from May 4, 1979, until November 28, 1990. This means she lived at 10 Downing Street for approximately 11 years and 6 months during her time in office. The film showcases her political journey and the significant events that occurred during her tenure.

Margaret Thatcher's downfall was primarily caused by internal dissent within the Conservative Party and public discontent over her policies. Key issues included the introduction of the Community Charge (poll tax), which faced widespread opposition and protests due to its unpopularity. Additionally, her increasingly authoritarian leadership style alienated many party members. The culmination of these factors led to a leadership challenge in 1990, where she ultimately decided to resign after failing to secure enough support, marking the end of her premiership.