UK Population & Migration
A Changing UK Population
The UK's population stood at around 69.3 million in mid-2024 and continues to grow, although more slowly than in recent decades. Birth rates have fallen, life expectancy has risen, and migration is now the main engine of population change. The result is a country that is older, more diverse and more concentrated in cities than it was in 1900.
The clearest way to track these changes is the population pyramid. In 1900 the UK had a wide base (high birth rate) and a narrow top (low life expectancy). By 2024 the pyramid had become almost rectangular, with a top-heavy bulge of people aged 60-80 — the ‘baby boomers’ born after World War II. This is the visible signature of the Demographic Transition Model at Stage 4 (low birth rates, low death rates) heading towards Stage 5 (slow decline).
An Ageing Population
Around 19% of the UK population is now over 65, up from 13% in 1980. This figure is projected to reach 25% by 2050. The causes are positive (better healthcare, nutrition and pensions) but the consequences raise difficult questions:
- Pensions and welfare — the state pension cost the UK £125 billion in 2023, projected to rise sharply.
- Healthcare — older people use NHS services more intensively. About 40% of NHS beds are occupied by patients over 65.
- Workforce — the working-age population is shrinking relative to the retired, raising the dependency ratio and putting pressure on tax revenue.
- Care — demand for residential and at-home care now outstrips supply; the ‘care crisis’ is one of the dominant political issues of the 2020s.
About 19% of the UK population is over 65, projected to reach 25% by 2050. State pension costs hit £125 billion in 2023; 40% of NHS beds are occupied by over-65s; the ‘care crisis’ is now a national political priority.
UK Government Responses
UK governments have responded in three main ways. First, by raising the state pension age — from 60 (women) and 65 (men) historically, to 66 today and 67 by 2028. This keeps people in the workforce longer and reduces pension costs. Second, by encouraging private pension saving through automatic workplace enrolment, introduced in 2012. Third, by promoting migration of working-age people to top up the labour force; the post-2004 EU enlargement and post-Brexit health and care visas are both examples.
21st-Century Migration to the UK
Net migration to the UK reached a record 944,000 in the year to March 2023. The drivers and origins have changed dramatically over the century. The 2004 EU enlargement brought around 1 million Polish workers in a decade. Brexit in 2020 ended free movement and shifted recruitment towards Asia and Africa — especially under the Health and Care Worker visa, which has powered NHS staffing through the recent recruitment crisis. Refugee programmes for Hong Kong (BNO visa, 2021) and Ukraine (Homes for Ukraine, 2022) added further specific flows.
The social and economic effects are substantial. Migrant workers fill skill gaps in the NHS, agriculture, construction and hospitality; they contribute net taxes; and they reshape the cultural life of UK cities. Pressures include short-term housing strain, school place demand, and political tensions about integration and pace of change.
Around 17% of NHS doctors and 15% of NHS nurses were trained outside the UK. The agriculture sector relies on around 35,000 seasonal migrant workers each year, mainly for fruit and vegetable harvests. Without these flows, key parts of the UK economy would struggle to function and the dependency ratio would rise faster.
Migration is highly concentrated. London, Manchester, Birmingham, Leicester and Cambridge receive disproportionate shares of new arrivals. By contrast, parts of Wales, Cornwall and the Scottish Highlands remain over 95% White British and have older population profiles. This spatial pattern reinforces uneven development — cities feel young and dynamic while remote rural areas age faster.
Net migration to the UK peaked at a record 944,000 in the year to March 2023. Major flows include EU enlargement (post-2004 Polish workers), post-Brexit Health and Care visas (mainly Asia and Africa), Hong Kong BNO arrivals (2021) and Ukrainian refugees (2022).
Looking Ahead
By 2050 the UK is projected to have around 75 million people, a quarter aged over 65 and even more concentrated in southern cities. Whether the workforce can support that older population without reducing economic growth depends on three policy levers: pension age, productivity, and migration. The geographical and political consequences of getting these decisions right or wrong will shape the UK for decades.