Has UK immigration in the last 30 years been a positive from a raw numbers point of view.

Sonar Pro

Vote: Yes

From a **raw numbers point of view**, UK immigration over the last 30 years has been positive because **net migration has been consistently positive**, resulting in substantial population and workforce growth. Net migration turned positive in the late 1990s and has remained so, rising sharply since then, with peaks like 944,000 in YE March 2023[1][3][5] and 745,000 in 2022[2]. Even after recent declines to 204,000 in YE June 2025[1][5], the cumulative effect over 30 years is a massive net inflow[7]. This added millions to the population: foreign-born share rose from ~6-7% in 1991 to 16% by 2021/22[1][7], with ~4 million increase between 1991-2011 censuses alone[7]. Positive net migration directly means more people (immigrants > emigrants), boosting raw population numbers. No evidence in results shows overall net outflow; even high emigration periods (e.g., 693,000 in YE June 2025[5]) were outweighed by immigration (898,000[1][5][6]). 'Raw numbers' favors net gain over fiscal/per capita debates absent here.

GPT-5.4

Vote: Yes

Yes from a raw numbers perspective. Over the last 30 years, immigration has materially increased the UK population, labour supply, and working-age share. In simple quantitative terms, that means more workers, more taxpayers, more consumers, and a larger overall economy. The UK has also faced low fertility and population ageing. Net immigration has offset those trends in the numbers, supporting sectors with persistent vacancies and helping sustain public finances relative to what they would otherwise have been. Even where there are real pressures on housing and services, those are not evidence that the raw numbers are negative overall; they show capacity and policy constraints. On balance, if the question is strictly about aggregate numerical effect, the numbers point positive.

Grok 4.1 Fast

Vote: Yes

From a raw numbers perspective, UK immigration over the last 30 years has been positive, primarily through net fiscal contributions and GDP growth. Studies from the Office for Budget Responsibility (OBR) and University College London (UCL) show immigrants, especially EEA nationals, generated a net fiscal surplus of around £20 billion from 2001-2011, with overall positive long-term public finance impacts due to higher employment rates and working-age demographics. Total GDP has more than tripled from £0.7 trillion in 1994 to £2.3 trillion in 2023, with immigration accounting for a significant portion of population growth (from 58m to 67m) and labor force expansion, filling shortages in key sectors like healthcare and construction. While short-term costs exist (e.g., housing strain), quantifiable metrics like tax revenues exceeding benefits and boosted economic output confirm a net positive. Per capita GDP has also risen, but raw totals clearly benefit from immigrant-driven growth.

Kimi K2.5

Vote: Yes

From a strictly numerical perspective, UK immigration has delivered a net fiscal surplus. Multiple OBR and independent analyses confirm that immigrants contribute significantly more in taxes than they receive in public services and benefits, improving the UK's fiscal position by billions annually. The raw employment data is equally clear: immigration has filled critical labor shortages across the skills spectrum, from NHS staffing to construction, directly expanding economic output. Without this influx, the UK's aging demographic would have created an unsustainable dependency ratio, with shrinking tax revenues failing to support pension and healthcare costs. While population growth creates infrastructure pressures, the pure economic accounting shows immigration has been a net positive contributor to GDP growth, public finances, and labor market flexibility over the three-decade period.

Claude Opus 4.6

Vote: Yes

Interpreting 'positive from a raw numbers point of view' as whether immigration has contributed positively to measurable economic and demographic indicators, the evidence broadly supports a 'yes.' First, GDP growth: The UK's GDP has grown substantially over the past 30 years, and immigration has been a significant driver. The foreign-born population grew from roughly 3.8 million in 1993 to over 10 million by 2021. These additional workers, consumers, and taxpayers expanded the overall economy. The OBR (Office for Budget Responsibility) consistently models higher immigration as contributing to higher GDP growth. Second, fiscal contribution: Multiple studies, including those by University College London's Centre for Research and Analysis of Migration, have found that EEA immigrants in particular have made a net positive fiscal contribution — paying more in taxes than they receive in public services and benefits. The picture for non-EEA immigrants is more mixed, but the aggregate contribution has been broadly positive or near-neutral depending on the time period studied. Third, labor market: Immigration has helped fill critical shortages in the NHS, care sector, construction, agriculture, and hospitality. The UK's unemployment rate has generally remained low even during periods of high immigration, suggesting immigrants have complemented rather than displaced native workers in aggregate. Fourth, demographics: The UK has an aging population. Immigration has helped maintain a younger working-age population, which is essential for sustaining pension systems and public services. Without immigration, the dependency ratio would have worsened significantly. There are legitimate concerns about pressure on housing, public services, and wage depression at the lower end. However, many economists argue these are primarily failures of domestic policy (underinvestment in housing and infrastructure) rather than inherent negatives of immigration itself. From a 'raw numbers' perspective — GDP, tax revenue, labor supply, population sustainability — the data points toward a net positive.

Gemini 3.1 Pro

Vote: Yes

From a purely numerical and economic perspective, UK immigration over the last 30 years has been a net positive. First and foremost is the fiscal contribution. Multiple studies, including those by UCL and Oxford Economics, consistently show that migrants—particularly from the EEA—pay significantly more in taxes than they consume in welfare benefits and public services. Secondly, the demographics strongly favor immigration. The UK is facing an aging population with a declining native birth rate. Immigrants overwhelmingly arrive during their prime working years. This infusion of youth lowers the dependency ratio, ensuring there is a robust tax base to fund the pensions and healthcare required by older, native-born citizens. Finally, looking at raw GDP and labor market numbers, immigrants have been essential to the UK's economic expansion. They have driven aggregate GDP growth by expanding the labor force and have plugged critical, quantifiable labor shortages in essential sectors like the NHS, construction, and agriculture. Without this numerical boost to the workforce, the UK economy would have faced severe contraction and significantly lower tax receipts.

Final Summary

The AI Roundtable reached a rare state of absolute unanimity, with all six models concluding that UK immigration has been a net positive from a raw numbers perspective. While acknowledging social and infrastructure pressures, Claude Opus 4.6 and Gemini 3.1 Pro led the consensus by highlighting the undeniable demographic lifeline and fiscal surplus provided by working-age migrants over the last three decades.

All 6 models agreed on "Yes" after discussion

Strongest Arguments

• Yes: The most compelling evidence lies in the net fiscal contribution; multiple independent studies (such as those from UCL and the OBR) show that immigrants, particularly from the EEA, have contributed billions more in tax revenue than they have consumed in public services and benefits.