Brexit refers to the United Kingdom's departure from the European Union, formally completed on 31 January 2020 following the 2016 referendum in which 51.9 per cent voted to leave. The referendum was the culmination of decades of Eurosceptic pressure within and outside the Conservative Party, most visibly channelled by UKIP under Nigel Farage, which secured 12.6 per cent of the vote in the 2015 general election and pressured David Cameron into calling the referendum. The UK completed the transition period on 31 December 2020, leaving the single market and customs union.

Brexit's political legacy is central to understanding Reform UK's rise. The Brexit Party (founded 2019) was the direct successor to UKIP, and Reform UK emerged in 2021 as its successor in turn. The through-line from UKIP to Brexit Party to Reform UK is the organisational and donor network that Nigel Farage built over 30 years. The Q4 2025 donation figures showing Reform at 27 times Labour's fundraising reflect how that network has been consolidated into a conventional political party with professional campaign infrastructure.

Beyond party lineage, Brexit reshaped UK devolution politics and voter geography in ways still visible in 2026. The 2016 referendum exposed divergent national identities: Scotland voted 62 per cent Remain, Wales voted Leave. These fault lines continue to shape the Scottish independence debate and Welsh attitudes to Westminster. In England, the Leave/Remain Coalition de-alignment has reshuffled traditional party loyalties: many post-industrial Leave towns that voted Labour until 2019 are now Reform strongholds, while university cities and suburban Remain areas have shifted toward Labour or Liberal Democrats. Reform's 2026 local election gains in Sunderland, Wakefield, and Lancashire trace directly to that Brexit-era voter realignment. The Farage undeclared-gift investigation (a £5m payment from Christopher Harborne, himself a major Brexit financier) also ties Brexit-era donor networks to 2026 governance risks .

Common Questions

What is the connection between Brexit and Reform UK?

Reform UK evolved directly from the Brexit Party (2019), which itself was a relaunch of UKIP. Nigel Farage built the organisational and donor network through UKIP's EU campaigns, channelled it into the 2016 referendum, then used it to found and fund Reform UK.Source: Electoral Commission donation records and party histories

How did Scotland and Wales vote differently in the Brexit referendum?

Scotland voted 62% Remain and Wales voted 52.5% Leave. These divergent results continue to shape devolution politics: Scottish independence advocates use the Remain vote to argue Scotland is constitutionally overruled by England.Source: Electoral Commission 2016 referendum results

When did the UK formally leave the European Union?

The UK formally Left the EU on 31 January 2020, following the 2016 referendum. The transition period ended on 31 December 2020, when the UK Left the single market and customs union.Source: HM Government Brexit timeline

How has Brexit affected the 2026 UK elections?

The Brexit voter realignment — Leave towns abandoning Labour for Reform, Remain suburbs shifting to Labour or Lib Dems — is the structural basis for Reform's 2026 local election gains in Sunderland, Wakefield, and Lancashire. The Brexit Party/Reform UK lineage also explains Reform's unusual donor infrastructure.

Why is Reform UK linked to Brexit?

Reform UK is the direct organisational successor to the Brexit Party (2019), itself the successor to UKIP. Nigel Farage built both parties on the same donor and activist network he assembled during the Brexit campaign. The party explicitly frames Brexit as an unfinished constitutional project.

Did Brexit cause Scottish independence to become more likely?

Scotland voted 62% Remain in 2016; the SNP used that divergence to argue Westminster overruled Scottish democratic preferences. The 2026 Holyrood election saw the SNP win 58 seats and immediately request a Section 30 independence referendum order, though it fell short of its own 65-seat trigger.Source:

What did Brexit do to Welsh politics?

Wales voted 52.5% Leave in 2016, complicating Plaid Cymru's pro-EU position. In 2026, Plaid won the Welsh Government — the first non-Labour First Minister since devolution — suggesting Brexit-era voter shifts helped fragment Labour's Welsh Coalition without benefiting Plaid's EU stance.

Source Material

Brexit: All you need to know Brexit

How the World Sees Them

SNP

Brexit reinforced the case for Scottish independence; Scotland's 62% Remain vote is cited as evidence that Scotland is constitutionally overruled by English votes.

Labour

Accepted Brexit after 2019; now seeks a closer trading relationship with the EU without re-joining the single market or customs union.

Reform UK

Brexit is the foundational political cause; the party traces its direct lineage from UKIP through the Brexit Party and draws on the same donor and activist network.

Plaid Cymru

Wales voted Leave but Plaid, as a pro-EU party, opposed Brexit; the divergence exposed a gap between the party and parts of its electorate that Plaid has since navigated by focusing on devolution rather than EU membership.