July 2019-October 2019: Boris Johnson (Conservative)
The third and least lamented Brexit era Prime Minister, Boris (as he is most often remembered in history) refused to ask for the fourth Article 50 extension, causing a legal crisis and his resignation.
October 2019-January 2020: James Cleverly (Conservative)
James Cleverly had the shortest time in office all Brexit era Prime Ministers - enough time to negotiate the fourth Article 50 extension - to 31 January 2020, and the fifth - to 31 August 2021. He is mostly remembered as the lamentable joiner between the Year of the Three Prime Ministers and the Year of the Five Prime Ministers.
January-March 2020: Dominic Raab (Conservative)
The second of five 2020 Prime Ministers, Raab was elected by his party to bring about Brexit immediately with no deal. A decision which he could not carry out without a snap election.
March 2020: Jeremy Corbyn (Labour) [281] Dominic Raab (Conservative) [268] Nicola Sturgeon (SNP) [49] Jo Swinson (Liberal Democrat) [19] Rory Stewart (Moderate Centre) [11] Arlene Foster (DUP) [8] Michelle O'Neill (Sinn Fein) [7] Adam Price (Plaid Cymru) [3] Naomi Long (Alliance) [2] Sian Berry and Jon Bartley (Green Party England & Wales) [1] Sylvia Herman (Independent) [1]
March 2020-July 2020: Jeremy Corbyn (Labour) coalition with Nicola Sturgeon (SNP), Jo Swinson (Liberal Democrat), Rory Stewart (Moderate Centre)
A No Deal Brexit was meant to be the Conservative Party's ultimate vote-winner, and in fact most polls up to election day showed that Raab had a healthy margin for victory. On the night, however, the votes weren't there. The Liberal Democrats and their "Moderate Centre" allies eventually agreed to prop up a government of the SNP and Labour, provided that it focused entirely on negotiating a soft brexit deal and putting it to the public.
July 2020-November 2020: Yvette Cooper (Labour) coalition with Nicola Sturgeon (SNP), Jo Swinson (Liberal Democrat), Rory Stewart (Moderate Centre)
While Corbyn remained leader of the Labour Party, he was unpopular with the other parties in his coalition and further, proved unable to negotiate a deal that satisfied his remainer allies. This lead to a vote of no confidence passing in his leadership in June, but not the end of the Remain coalition. Yvette Cooper was seen as a reasonable compromise for a new round of negotiations, although her leadership was never accepted by the Labour Party itself and she was unable to achieve anything beyond negotiating a deal that would mean free trade and freedom of movement with the EU.
October 2020 EU Referendum: Remain: 55.2% Deal: 44.8%
Yvette Cooper's deal was too weak for Leaver's to get behind, and was supported mostly by people who actually wanted to remain in the EU. The result was a decisive victory for remain in the third European referendum, but no great unifying moment for the country.
October 2020-October 2031: Jacob Rees-Mogg (Conservative)
October 2020: Jacob Rees-Mogg (Conservative) [352] Jeremy Corbyn (Labour) [244] Jo Swinson (Liberal Democrat) [13] Nicola Sturgeon (SNP) [12] Arlene Foster (DUP) [7] Michelle O'Neill (Sinn Fein) [7] Rory Stewart (Moderate Centre) [5] Adam Price (Plaid Cymru) [4] Naomi Long (Alliance) [3] Yvette Cooper (Reform) [2] Sian Berry and Jon Bartley (Green Party England & Wales) [1] Sylvia Herman (Independent) [1]
The final Prime Minister in the year of the five Prime Ministers would go on to restore a measure of stability to the UK. In September 2021, contrary to the result of the last referendum, he left the EU without a deal in a flurry of riots, border issues, and medical shortages. This action secured his reputation as the most hated Prime Minister among remainers. Protests of various shades would define his time as Prime Minister and the practice of pushing these further and further from parliament lead to increased violence, which spilled over into open rioting in 2024, including an attempt on the Prime Minister's life. Following this, greater security was introduced around parliament and the palace. Further riots in 2025 lead to these areas being cordoned off forming a restricted zone that would in time become known as "The Citadel".
October 2025: Jacob Rees-Mogg (Conservative) [295] Rory Stewart (European Democratic Party) [148] Laura Pidcock (Labour) [143] Mhairi Black (SNP) [44] Michelle O'Neill (Sinn Fein) [10] Nuala McAllister (Alliance) [9] Adam Price (Plaid Cymru) [3] Emma Little Pengelly (DUP) [2]
Labour, formerly the second party of the UK, never quite got over most of the parliamentary party "betraying" Jeremy Corbyn. The 2025 party was a much purged and extreme organisation which also pursued a neutral policy on Europe - an issue that was coming to hold a symbolic value to much of the country. The new EDP was formed out of the Liberals, Reform, and the Moderate Centre. While it would take a long time for them to make progress in Labour heartlands the new party emerged as the party of opposition. However, only the Conservatives were in anything like a position to form government and they lacked the allies to actually do so. Jacob Rees-Mogg continued as Prime Minister without a functional parliament.
November 2025: Jacob Rees-Mogg (Conservative) [305] Rory Stewart (European Democratic Party) [174] Laura Pidcock (Labour) [88] Mhairi Black (SNP) [56] Michelle O'Neill (Sinn Fein) [12] Nuala McAllister (Alliance) [4] Steven Morrissey (For Britain) [3] Adam Price (Plaid Cymru) [3] Emma Little Pengelly (DUP) [5]
Once again, no majority existed in the country, but with Christmas coming and all the parties having depleted resources the next election was held off for as long as possible. While Jacob Rees-Mogg couldn't do a great deal in this time, it would provide a prototype for the process of ruling the UK without parliamentary consent which would become important in the late Brexit era.
May 2026: Jacob Rees-Mogg (Conservative) [327] Rory Stewart (European Democratic Party) [177] Laura Pidcock (Labour) [62] Mhairi Black (SNP) [59] Michelle O'Neill (Sinn Fein) [12] Nuala McAllister (Alliance) [7] Steven Morrissey (For Britain) [1] Adam Price (Plaid Cymru) [3]
After three attempts, Rees-Mogg finally emerged with a majority, however slight. However, the country was divided. There were now clear majorities for independence in Northern Ireland and Scotland and London was a firm EDP stronghold. While Rees-Mogg continued to rule with the consent of parliament, far more decisions were being made by statutory instrument and ministerial fiat. Even so, the ardently conservative Prime Minister kept away from social matters, where his majority was weakest, and focused on reorganising healthcare, lowering taxes, and reducing regulations.
A new National Police Force was organised and given direct control over security at the Citadel, and enhanced security and surveillance powers were introduced to deal with ongoing, now somewhat traditional, political violence. Clashes between violent forces connected to UKIP and to the antifa movement were standard, eco-terrorism was increasing, and even the Rejoin movement had a growing number of violent people in what was thought of as the Blue Bloc.
2031-3036: Thomas Berns (European Democratic Party) coalition with Alan Osmond (Labour)
May 2031: Thomas Berns (European Democratic Party) [321] Jacob Rees-Mogg (Conservative [184] Alan Osmond (Labour) [59] Mhairi Black (Scottish) [59] Siobhan O'Donnavan (Irish) [19] Mia Lloyd (Plaid Cymru) [6]
Thomas Berns would be the last British Prime Minister to serve only after winning a general election. He would try to bring some normality back to British politics and pushed for the great unfinished projects of British social reform - LGBTQ+ inclusive education, gender self-ID, polyamorous marriage, and repeal of the porn laws. However, he also had to deal with Scottish and Northern Irish nationalism. August 2032 saw a border poll in Northern Ireland and a decision to reunite Ireland. The deadline for this was set for 2035 and before this could even go through, the Scottish parliament declared independence without a referendum. British military assets were activated, along with the national constabulary, and the Scottish Parliament was suspended.
Following this, Europe made it clear that they would not tolerate similar delays or prevarications in Northern Ireland, even going so far as to station military troops in the Republic of Ireland.
May 2036: Thomas Berns (European Democratic Party) [278] Alison Keys-Clarke (Unionist & Conservative Party) [268] Alan Osmond (Labour) [19] Mhairi Black (Scottish) [24] Mia Lloyd (Plaid Cymru) [11]
Once again, an election passed without a clear majority but this time, it was not even clear who had the upper hand - the EDP had more seats, but the newly restructured UCP had more votes. The Scottish and Welsh Parties refused to work with either group and that left both without a majority. A second UDI crisis sparked off in Scotland in June and by July a new election date had still not been set, a queen's speech and a formal opening of parliament was not forthcoming, but the UK government seemed to be negotiating Scottish independence for its own party political ends.
Summer was mostly spent on legal disputes over whether any of this could be done, leading to UCP backed officers from the National Police Force to attempt to arrest Thomas Berns in 2036. The National Police Force hit a roadblock when the London Police Department wouldn't allow Berns to be held in their cells, and he gave an order to remove the NPF from the Citadel. They refused to leave.
2039-2042: Alison Keyes-Clarke (Unionist & Conservative Party) OR Thomas Berns (European Democratic Party)
A few days after the beginning of a police standoff in the Citadel a special meeting of 286 MPs passed a vote of no confidence in Thomas Berns, and shortly after the leader of the UCP established a permanent new parliament in Colchester, which claimed sole legitimacy. While the monarchy called for calm, the NPF was now in open conflict with city police forces across the UK. When Thomas Berns banned the new Colchester Parliament outright and sent the LPD into Essex to make the arrest, the army became involved.
The army held the line, but their attempt to invade London caused open civil war - London civilians fighting the army and eventually London military assets defending the city against the British army. London would hold out for the full three years of the war, but in the rest of the country much of the professional army sided with the UCP.
March 2042-May 2042: Alison Keyes-Clarke (Unionist & Conservative Party)
Finally ensconced in The Citadel, Keyes-Clarke wasted no time in calling an election to secure her legitimacy as Prime Minister. This was, in some ways, a strange move. Historians have spent a large amount of time trying to understand why she did this. Pro-Brexit historians usually assume that she was a true democrat who wanted to restore parliament, while Remainers feel she likely thought that enough EDP and Nationalist politicians were in prison that the election would be a cake-walk. One factor that both agree on is that Alison had been living mostly in UCP strongholds and had unrealistic notions about how British people had experienced the past two years.
2042-2086: Devon Laing (European Democratic Party)
2042: Devon Laing (European Democratic Party) [316] Alison Keys-Clarke (Unionist & Conservative Party) [232] Alan Osmond (Labour) [52]
Devon Laing was born in 2016, a month after the second European Referendum, and distinguished themself during the civil war as part of the armed forces. They had no political experience and likely wouldn't have become an MP, much less a party leader, without the chaos of the past three years. Following their surprise election, only the direct intervention of Alison Keyes-Clarke prevented their arrest and allowed the EDP to form a government. Devon ignored Alison's request for a coalition government, but didn't authorise her arrest. He did learn from her mistakes, however. In their time in office Devon would take direct control of the National Police Force and the Army, purge and restructure both, and substantially increase defences around The Citadel.
In 2047, Devon called for a year's delay to the election to allow time for reconstruction, this was delayed again in 2048. In 2050 the election was delayed again, this time by five years. After that people allowed the issue of a general election to be dropped. Even the term "Prime Minister" would fall out of favour - it was clear that Devon's power came from the police, not from Parliament. The 2050s was a chaotic time for the whole world, with the EU replaced by a quasi-fascistic Alliance of European Nations and the USA falling prey to political dynasties. Starvation, disease and climate chaos were rife and by the time the British people looked up and realised they were living in a dictatorship, the system was well established. The era of parliamentary constitutional monarchy was over.