On 23 June 2016, 17.4 million British voters chose to leave the European Union. Polls conducted at and around the referendum found immigration was the largest single reason cited by "Leave" voters: about a third identified immigration control as their primary motivation, and another 49% cited sovereignty, a framing closely tied to control over who entered the country.[8]
Now nearly a decade later, net migration to the United Kingdom has risen considerably. It crossed one million for the first time in 2023, roughly three times the figure in the year of the referendum and four times the 256,000 the Conservative party had inherited in 2010.[1] The political class that the 2016 vote had instructed to reduce immigration produced the largest increase in modern British history. In July 2024, voters removed that political class in the worst Conservative defeat in the party's nearly 200-year history.
The 1971 Immigration Act, the 1981 British Nationality Act, and the points-based system launched in January 2021 are the laws that determine who may enter the United Kingdom and at what numbers. The Conservatives did not amend the underlying architecture to lower admissions. They built new routes inside it - the Health and Care Worker visa, the Graduate Route, the lowered Skilled Worker thresholds - that produced flows larger than the EU free-movement regime the referendum had ended.
The British experience is the clearest available case study in what happens when an elected mandate to reduce immigration meets a policy apparatus that has not been rewritten to deliver it. The United States is running a parallel administrative campaign in 2026: a $100,000 H-1B sponsor fee, a 38-country travel ban, expanded removals, and an effectively closed southern border. The Immigration Act of 1990 has not been amended in 35 years. The administrative measures producing the current cut sit on top of the same statutory framework that authorised the pre-2025 levels.
The Pre-Brexit Context
The Conservative Party had committed in its 2010, 2015, and 2017 manifestos to reducing net migration to "the tens of thousands."[2] The figure was not met in any year between 2010 and 2024 (when the Conservatives lost control); the lowest reading of the period was 177,000 in 2012. The 2016 referendum, in that context, was a verdict on six years of unmet pledges: voters were asked whether reduction would be possible outside the EU framework when it had not been delivered inside it, and answered yes by 52 to 48.
The Numbers
Net Migration to the UK, 2010-2024
Britain voted in 2016 to cut immigration. It rose to a record instead.
The 256,000 the Conservatives inherited in 2010 became a record above one million in 2023. Cumulative net migration from 2010 to 2024 was roughly 4.5 million, more than the population of Wales.
Sources: UK Office for National Statistics; Migration Observatory
Cumulative net migration from 2010 to 2024 was approximately 4.5 million, more than the population of Wales.[5] The "reduced" figure of 431,000 in 2024, after emergency restrictions had been imposed, was still higher than any single year recorded under the preceding Labour government.
What Vote Leave Promised
The Vote Leave campaign, led by Boris Johnson, Michael Gove, and Dominic Cummings, told voters in 2016 that the points-based system that would replace EU free movement would deliver lower overall numbers. UKIP, led by Nigel Farage, ran a parallel campaign in which immigration was the explicit and central issue. The "Take Back Control" slogan was interpreted by voters principally as a promise to reduce immigration.
The Conservatives ended EU free movement on 31 December 2020. The new points-based system launched on 1 January 2021 contained no overall numerical cap. The Health and Care Worker route was expanded in February 2022. The Graduate Route, introduced in July 2021, allowed international students to remain for two years after graduation with no job offer required. Non-EU net migration in 2023 was approximately +750,000; EU net migration was negative.[1]
The Conservative answer to a 2016 vote for less immigration was to end one channel and open three larger ones. The mandate was treated as permission to restructure the source mix rather than as an instruction to lower the total.
The Composition Shift
Pre-2021 immigration was predominantly from within the European Union, with Polish, Romanian, and Bulgarian nationals making up the largest flows. The points-based system launched in January 2021 shifted the source composition almost immediately.
Top non-EU nationalities for net migration, 2023:
| Nationality | Net Migration |
|---|---|
| India | 250,000 |
| Nigeria | 141,000 |
| China | 90,000 |
| Pakistan | 83,000 |
| Zimbabwe | 36,000 |
By 2024, non-EU nationals accounted for +544,000 net arrivals, EU nationals were leaving on net at -96,000, and British nationals were also leaving at -17,000.[1] The new composition produced larger total flows than the regime it replaced. The Muslim share of the population of England and Wales rose from 3.0% in 2001 to 4.8% in 2011 and 6.5% in 2021 - approximately doubling in twenty years.[7] The religious and cultural composition of the country changed substantially faster than total population growth would suggest.
The Visa Routes That Opened the Floodgates
The Conservative government created specific policy mechanisms that dramatically increased immigration.
The Health and Care Worker visa was expanded in February 2022 to include entry-level care workers, a single regulatory change that became the largest driver of the post-Brexit migration surge. By the end of 2024, 648,100 people had applied through this route, including dependants, and care-worker applications made up 65% of all Skilled Worker visa applications.[9] The route was immediately exploited. Over 470 sponsor licenses were revoked between July 2022 and December 2024. Over 39,000 workers were sponsored by companies whose licenses were later revoked.[10] Workers reported being charged up to £40,000 by scam sponsors for a visa that officially costs £284.[10]
The Graduate Route, introduced in July 2021, allowed international students to stay and work for two years with no job offer required. By 2024, 172,000 graduate route visas were issued in a single year, a 49% increase over the previous year.[6]
The "points-based" system was presented as tough and Australian-style, but the design did not match the marketing. The salary threshold was lowered from £30,000 to £25,600, the skill requirement was lowered to A-level equivalent, Shortage Occupation List workers received a further 20% discount, and "new entrants" under 26 could qualify at just £20,500.[3] Fifty of the required 70 points were essentially automatic. The system contained no overall numerical cap. A points framework without a ceiling is a sorting mechanism, not a numerical control.
The Demographic Effect
By the 2021 census, four English cities had become "no-majority" cities, places where no single ethnic or national-origin group constituted more than 50% of the population.[7] London, Birmingham, Leicester, and Manchester all crossed that threshold within a generation. The change was driven by the sheer volume of arrivals - more than 4.5 million net additions between 2010 and 2024, concentrated in a handful of metropolitan areas with limited housing stock and overstretched public services. The volume itself, not the source-country mix, is what changed the country.
The Electoral Reckoning
In July 2024, the Conservatives won 121 seats, down from 365 in 2019. Twelve Cabinet ministers lost their seats, including former Prime Minister Liz Truss.[12] It was the worst defeat in the party's nearly 200-year history. Reform UK won 14.3% of the national vote, approximately 4 million votes, and in 137 seats that the Conservatives lost to Labour the combined Conservative-plus-Reform vote exceeded the winning Labour total.[12] Among 2019 Conservative voters who reported having lost faith on the immigration question, only 38% stayed with the party while 41% switched to Reform.[12]
Why the Mandate Was Not Delivered
The Conservative Party acknowledged voters' instruction in 2010, accepted the 2016 referendum result, and repeated the pledge in 2017 and 2019. After each instruction, the party in government produced larger numbers than the year before. Business lobbying for cheap labour, NHS dependence on foreign workers, Treasury models that scored higher immigration as higher GDP, and a senior civil service committed to existing routes pushed in the same direction throughout. The political will to override those forces was never present, and the "tens of thousands" pledge functioned as electoral marketing while the machinery of government imported workers at scale.
The post-2021 points-based system contained no overall numerical ceiling, the salary thresholds sat below the median wage, and the Health and Care Worker route had no quota. A framework without numerical limits produces whatever flow its existing employer base and demand generate.
Farage and the Restore Britain Alternative
The political vehicle that captured the Conservative-defector vote in July 2024 was Reform UK, led by Nigel Farage. Reform took 14.3% of the national vote on the unfulfilled 2016 mandate. Farage was central to the construction of that mandate: UKIP under his leadership made immigration the defining issue of the referendum, and the "Take Back Control" slogan was understood by Leave voters as a commitment to cut arrivals. He campaigned in 2024 as the inheritor of the mandate the Conservatives had failed to deliver.
What he offered structurally was the same product the Conservatives had sold. The Reform 2024 manifesto called for net migration to be "frozen" and for new arrivals to be limited to "essential" workers, but contained no specific numerical cap, no proposed replacement for the 1971 Immigration Act or the 1981 British Nationality Act, and no removal target for the illegal population in the country. As of mid-2025, Reform's parliamentary group had introduced no legislation lowering the statutory admissions architecture. Farage sold British voters a numerical promise in 2016 and offered no statutory mechanism to deliver it in 2024.
Rupert Lowe, elected as a Reform MP for Great Yarmouth in July 2024, broke with the party in early 2025 over the absence of a serious policy programme. He launched Restore Britain as a pressure group in June 2025 and registered it as a political party on 13 February 2026, positioning it to Reform's right on immigration.[16] The Restore Britain programme proposes specific annual caps, a removal target for the illegal population, and the disapplication of European Convention on Human Rights provisions that British courts have used to block deportations.[16] What it has produced - and what neither the Conservatives nor Reform did - is a written, numerically specific statutory programme.
The American Lesson
The Trump administration won the 2024 presidential election with illegal immigration as a defining campaign issue and has delivered. Border crossings are down approximately 98% from the 2023 peak. Criminal-alien removals have expanded materially. The $100,000 H-1B sponsor fee is reshaping employer behaviour. The 38-country travel ban is in force. Annual legal admissions are projected at about 575,000 in 2026, down from the 2024 peak of 1.36 million. These are real outcomes from the executive branch, and they are likely to hold through this administration and a successor in the same coalition.
The portion of the mandate that has not been addressed is the volume of legal immigration set by statute. The Immigration Act of 1990 raised legal admissions from 270,000 to 675,000 per year, created the H-1B visa, and created the Diversity Visa Lottery. Three Republican administrations and four Democratic administrations have left it intact in the 35 years since George H.W. Bush signed it. Congressional Republicans hold both chambers in 2026 and have not introduced a bill to replace it. A meaningful share of the 2024 vote was against the legal admissions schedule that statute produces, not just against illegal crossings.
Codifying the current cut into statute is the next step that turns a presidential program into long-term American policy. Congress would have to lower the admissions cap below 675,000, eliminate the Diversity Visa Lottery, narrow family-based admissions to spouses and minor children of citizens, and replace the H-1B program with a numerically capped exceptional-talent route at a salary floor above the 95th percentile of the relevant U.S. occupation. The 1924 Immigration Act worked as a model because it operated on hard numerical quotas written into statute and held for 41 years across both parties' presidencies. The Restore Britain programme, whatever its electoral fate, is the kind of written, numerically specific document that congressional Republicans have not produced on legal immigration since the 1990 Act passed.
The British case is the cautionary one. British voters instructed their political class to reduce immigration in the 2016 referendum, in 2017, and in 2019. The political class delivered larger numbers in every successive year until the 2024 election removed it. The statute that produced the flow remained on the books, and the flow continued under the successor government. The Republican mandate to address legal immigration alongside illegal exists in the United States in 2026. Converting it into a statutory replacement for the 1990 Act is what would lock the current reduction into multi-decade law.
Sources
- ONS, Long-term International Migration, Provisional: Year Ending December 2024
- Migration Observatory, "Net Migration to the UK"
- Migration Observatory, "The UK's 2021 Points-Based Immigration System" (Policy Primer)
- Centre for Policy Studies, "Net Migration Hits 2 Million Over This Parliament," 2024
- House of Commons Library, Migration Statistics (Research Briefing SN06077)
- House of Commons Library, "How Has Immigration Changed Under the Points-Based System?"
- ONS, "Ethnic Group, England and Wales: Census 2021" and "Religion, England and Wales: Census 2021"
- Post-referendum polling on Leave-voter motivations, 2016
- National Audit Office, "Immigration: Skilled Worker Visas," March 2025
- Business & Human Rights Resource Centre, "UK: Over 39,000 Care Workers Sponsored by Companies Whose Licenses Were Later Revoked," 2025
- Migration Watch UK, "The Conservative Performance on Immigration Since 2010" (Briefing Paper 350)
- House of Commons Library, "General Election 2024: Results and Analysis"
- Full Fact, "The Net Migration Target"
- Conservative Party Manifestos: 2010, 2015, 2017, 2019
- U.S. Census Bureau, Decennial Census 1990 and American Community Survey 2024
- Restore Britain, official policy programme