On 31 March 1990, a large-scale demonstration against the Community Charge, colloquially known as the Poll Tax, descended into significant civil disorder in central London. The protest, which saw tens of thousands of people march from Kennington Park to Trafalgar Square, was organised by the All Britain Anti-Poll Tax Federation to express widespread public fury over the new taxation system introduced by Margaret Thatcher's Conservative government. The policy was deeply controversial because it replaced the previous rates system with a flat-rate per capita tax, a change that many critics argued was fundamentally regressive and placed an unfair financial burden on those with lower incomes.

As the demonstration reached the area around Trafalgar Square and Whitehall, the atmosphere shifted dramatically. Clashes broke out between protesters and the police, resulting in widespread rioting, the looting of shops, and damage to public and private property. The scale of the violence was unprecedented for a political protest in the capital at the time, leaving many injured and leading to hundreds of arrests. The intensity of the unrest highlighted the depth of the public's anger and the perceived social injustice of the new tax regime, which had already been implemented in Scotland the previous year.

The events of that day marked a pivotal moment in Contemporary Britain, serving as a catalyst for the eventual downfall of the Prime Minister. The disorder was widely viewed as a manifestation of the severe political polarisation that characterised the late 1980s and early 1990s. The political crisis triggered by the riots intensified internal party opposition to Margaret Thatcher, ultimately contributing to her resignation from office later that same year in November 1990.

• The protest was organised to oppose the flat-rate Community Charge.
• Demonstrators marched from Kennington Park to Trafalgar Square.
• The event escalated into significant rioting and civil disorder.
• The unrest placed immense pressure on the leadership of Margaret Thatcher.
• The policy was eventually replaced by the Council Tax in 1993.