@Time Enough liked the old version of this that ended with "the Greens will likely be in power for a long time" so... an updated version of my political journey in list form
A World Turned Upside Sideways
1997-2003: Tony Blair (Labour)
The last Labour government was elected on a small majority, with the Liberal Democrats close to second place. Devolution for Wales, Scotland and Northern Ireland was implemented. The government's handling of the Milennium Bug Crisis caused a massive split in the party and Blair limped on, even managing to push the elections back a year to deal with the crisis.
2003-2008: Charles Kennedy (Liberal Democrat)
Propelled into government as the party most strongly associated with opposition to Blair's handling of Y2K and international terrorism, the Liberal Democrats avoided the wars in the Middle East, implemented STV, brought in the Euro, created an elected Senate and bought in regional devolution, but did little to deal with left wing agitation that broke out in the next election. Particularly during the Credit Crisis.
2008-2011: Caroline Lucas (Green Party England & Wales)
Caroline Lucas had never served in Parliament, but found herself suddenly at the front of a Red-Green Alliance. The new government worked towards implementing LVT, legalised Cannabis, and brought in gay marriage but came to be seen as revisionist by the more left wing elements, who were brought into power following a general strike.
2011-2014: Ian Bone (Anarchist)
Britain's revolutionary government spent three years operating on a narrow majority, having to make deals with the Liberals, Greens, and even the Conservative-Labour Alliance to pass laws. Those laws included full drug decriminalisation and massive defunding for police, along with incentives to help people establish communes and worker's co-ops. Three years in, they finally failed to cobble together enough support to keep the government running and an election was called.
2014-2018: Natalie Bennett (Green Party)
The first Green majority government was elected on a landslide and has overseen a period of relative prosperity where Britain has lead moves towards disarmament, nuclear decommissioning and environmental policies. The Greens were riding high, but their policy of offering an EU referendum and campaigning to remain in the EU backfired with a vote to leave which split the government, leading to collapse.
2018-2020: Jeremy Corbyn (Labour)
Labour returned to power with a minority government but held power for two years, pushing the country towards nationalisation, and further towards pacifism. The Green New Deal was supplemented by what came to be known as The Red New Deal - an attempt to help workers buy out their companies. Labour's biggest problem was the rise of Normalism - a political ideology that was anti-Brexit, anti-Green, pro-capitalist, and coalesced over opposition to trans rights as conversations about gender self-ID began in 2019. In late 2019 Normalist terrorists overreached, using a dirty nuclear bomb on London Pride. A major clampdown was planned on Normalism, however it had supporters in all parties. When J.K Rowling was bought into custody, there was rioting and a brief attempt at a parliamentary coup. While order was restored, the traditional party system collapsed utterly.
2020: Munroe Bergdorf (Trans Rights Independent)
The new anti-normalist coalition is headed up by an MP who was forced out of Labour after accusations of racism against white people. Where Labour promised gender self-ID binary trans people over 18 the new government has implemented self-ID without a declaration for all with explicit protections for non-binary people. Brexit has been delayed due to the pandemic but Bergdorf plans to hold a second referendum in 2021, before resigning and hopefully allowing normal party politics to return. Provided the mainstream parties are in a state where one of them can win an election.