UK irregular migration statistics recorded 38,086 detected arrivals via illegal entry routes in the year ending June 2026, including 33,374 small boat arrivals. These are records of entry events during a period. They do not tell us how many people currently live in the UK without immigration permission. There is no current official total for that resident population. This guide explains the figures, their dates and the questions each dataset can answer.
Data checked: 3 November 2026. The latest quarterly release reviewed here was published on 27 August 2026. A separate provisional daily snapshot runs through 2 November 2026. The two series have different reference periods and levels of quality assurance. Sources: Home Office quarterly entry-route statistics and the daily small boat publication.
Latest UK irregular migration statistics: the official quarterly picture
The year ending June 2026 covers 1 July 2025 to 30 June 2026. It is a rolling twelve-month period, rather than January to June or the whole of calendar 2026. The following categories come from the same edition of the Home Office workbook.
| Recorded category | Detections | What the category describes |
|---|---|---|
| Small boat arrivals | 33,374 | Detected arrivals associated with crossing the English Channel in small boats. |
| Inadequately documented air arrivals | 2,492 | Recorded intentional attempts to arrive by air without adequate documentation or using fraudulent documents. |
| Recorded detections in the UK | 1,962 | People encountered who were believed to have entered without permission within the preceding 72 hours. |
| Recorded detections at UK ports | 258 | Port detections under this dataset’s specific coverage rules. |
| Combined recorded total | 38,086 | A total across these recorded categories, not a census of all unauthorised entry or residence. |
Source: Home Office summary workbook, table IER_01 and its notes. Coverage differs by route, so the table should not be used to calculate the true probability of entry by each method. People who avoid detection are missing by definition. The combined total was 22% lower than in the previous rolling year.
Small boat arrivals in 2026: a separate provisional snapshot
Adding the official daily operational records from 1 January through 2 November 2026 gives 22,605 recorded people arriving on 328 boats. This is a year-to-date calculation, not a complete 2026 annual figure or an estimate of people currently residing without permission.
To reproduce it, the downloaded daily time series contains 21,869 arrivals on 317 boats through 30 October. The official last-seven-days page adds 259 people on four boats on 31 October, 477 on seven boats on 1 November, and zero on 2 November. Only the three dates beyond the downloaded series were added; overlapping dates were not counted twice. Sources: the Home Office downloadable time series and last-seven-days table updated 3 November.
The operational publication is provisional. Quarterly figures undergo fuller quality assurance and may differ. Use the snapshot for a dated account of recently recorded activity, and the quarterly release for the corresponding quality-assured period. A zero-arrival day cannot establish that nobody entered through another route or avoided detection.
Do not compare 22,605 directly with a complete previous calendar year and call the difference an annual percentage fall. Compare matching start and end dates, preferably from the same series and revision, and account for seasonal variation. This page’s snapshot will also become older as new daily records appear.
Irregular immigration, detected arrivals and population: different measures
Searches for “UK illegal immigration statistics” can mean several different things. The official entry-route series now uses the label “illegal entry routes”; older releases and other researchers may use “irregular”, “unauthorised” or “undocumented” migration. Read the definition attached to a particular measure before treating two labels as interchangeable.
| Question | Measure needed | Frequent mistake |
|---|---|---|
| How many arrivals were detected during a period? | An entry flow, with a start and end date. | Calling the flow the resident population. |
| How many people live here without permission now? | A population stock at a stated date, with a credible estimation method. | Adding years of small boat arrivals. |
| How many boats were recorded? | A vessel count. | Using boats and people as the same unit. |
| How many people claimed asylum? | Asylum-system data, checking whether dependants are included. | Assuming every claim is a new border crossing. |
| What happened to an individual’s permission? | That person’s immigration record and relevant rules. | Inferring legal status from a national statistic. |
A flow counts activity over time; a stock describes a population at a point in time. Repeated recorded events can also involve the same person. For personal route information, our UK visa guide separates visitor, study, work and family options from these public statistical measures.
How many illegal immigrants are in the UK?
A reliable current official total is not available. It would be misleading to present 38,086, 33,374 or a cumulative Channel-crossing total as the answer. The Migration Observatory’s July 2026 briefing on unauthorised migration explains why the population is largely unknown and why entry detections are incomplete evidence.
Some people enter with permission and later overstay. Others may enter without permission and subsequently obtain a status allowing them to remain. People leave, die or change status over time. A current population estimate needs to account for these movements and transitions, including people never recorded entering by a particular route.
Historical research estimates need their original reference year, definition and method. A modelled range for an older year is not a new headcount merely because a website republishes it today. Check whether the study included people awaiting asylum decisions, which population was covered and how uncertainty was assessed.
The ONS research update of April 2026 describes ongoing work on estimating unauthorised flows and population stock. It discusses potential modelling using administrative data and academic evaluation. A research programme is not the publication of a completed current population estimate; this guide therefore does not convert that work into a headline total.
What do UK small boat crossing statistics include?
The quarterly series covers detected arrivals, including people encountered in the Channel and brought to the UK, and qualifying encounters shortly after a suspected small boat arrival. It excludes undetected arrivals and people prevented from departing France or intercepted and returned there by French authorities. Read the Home Office user guide’s entry-route definitions for the full coverage.
For the year ending June 2026, the small boat count fell from 43,309 to 33,374 compared with the preceding rolling year: a reduction of 9,935, or approximately 23%. That compares matching twelve-month windows. Small boats made up approximately 88% of recorded detections across the entry categories, rather than 88% of every undetected or unauthorised movement.
Worked example: 33,374 ÷ 38,086 × 100 = approximately 87.6%, which rounds to 88%. The denominator is the recorded total in this entry-route series. Replacing it with all immigration, all asylum claims or the resident population would create a different question and an invalid interpretation of that percentage.
Weather and seasonality affect recorded Channel activity. A short run of unusually high or low days cannot by itself demonstrate that a policy caused a lasting change. Consider a longer comparable period and other explanations before drawing a causal conclusion.
UK small boat arrivals by year: complete calendar years
This historical table uses the latest reviewed quarterly workbook consistently. It lists complete January–December years. The 2026 provisional snapshot appears separately above because its year is incomplete.
| Calendar year | Recorded arrivals |
|---|---|
| 2018 | 299 |
| 2019 | 1,843 |
| 2020 | 8,466 |
| 2021 | 28,526 |
| 2022 | 45,774 |
| 2023 | 29,437 |
| 2024 | 36,816 |
| 2025 | 41,472 |
Source: year-ending-June-2026 workbook, IER_01 and IER_02a. Historical values can be revised. For example, this edition reports 45,774 for 2022; older accounts may show 45,755. Use a single edition for a comparison and keep its notes, rather than silently combining versions.
The rolling year ending June 2026 includes July–December 2025. Adding that rolling total to the full calendar 2025 total would count those six months twice. Equally, the January–June 2026 subtotal of 11,884 is a six-month figure, whereas 33,374 covers twelve months. A column labelled only “2026” hides this crucial difference.
What do the figures show by country of origin?
For country-related searches, the official table records nationality. That is not automatically country of birth, previous residence or the country from which a journey began. The five largest recorded nationality groups among small boat arrivals in the year ending June 2026 were:
| Recorded nationality | Arrivals |
|---|---|
| Eritrean | 5,875 |
| Sudanese | 4,191 |
| Afghan | 4,042 |
| Somali | 3,901 |
| Iranian | 3,657 |
Source: table IER_02b. Nationality was not currently recorded for 1,140 of the 33,374 arrivals. Percentages calculated only among known nationalities therefore use 32,234 as the denominator. State whether unknown cases are included before comparing percentages.
These are arrival-period records for a specific route. They cannot show the current status of every person in a nationality group, or the size of that nationality’s unauthorised resident population. Avoid drawing conclusions about individuals from group statistics.
Can visa overstayers in the UK be counted from missing departures?
No: a missing departure record is not proof of overstaying. The ONS April 2026 research update identifies several possible explanations, including unmatched travel records, journeys through the Common Travel Area and different documents used by dual nationals. It also discusses people who retain permission while an application is pending and work on identifying overstayers.
These administrative questions require more than subtracting recorded departures from visa grants. Visas and journeys are different units; people can travel repeatedly, change permission or obtain settlement. A statistical discrepancy is a reason to examine data quality and definitions, not a basis for declaring that an identified person is living unlawfully.
An expired physical immigration document also needs to be distinguished from the underlying permission. Readers checking their own digital record can follow our UK eVisa access and status-sharing guide. Account access and national population measurement are separate tasks.
UK asylum statistics are a separate series
In the year ending June 2026, 85,891 people claimed asylum, including main applicants and dependants. The Home Office asylum-claims chapter explains that one claim can include several people and that people may claim after arriving through different routes.
It reports 33,949 asylum seekers whose recorded prior route was a small boat, based on the date of claim. The entry-route total of 33,374 uses the date of arrival. These are not contradictory counts of an identical cohort: someone may arrive in one period and claim in another. Do not subtract one from the other to manufacture a number of “missing” people.
Applications, people, initial decisions, appeals and pending cases describe different stages or units. Neither the number awaiting a decision nor a year’s refusal total is a ready-made count of everyone currently residing without permission. Establish the relevant case outcome and time before making a status claim.
UK net migration versus illegal immigration
Net migration is immigration minus emigration under the population-statistics definition. The ONS describes a long-term international migrant as someone changing their country of usual residence for at least twelve months. See its guide to understanding international migration statistics.
That is a different measurement from detected entry events. A fall in net migration does not by itself establish the direction of irregular entry, and an increase in recorded Channel crossings does not describe the whole migration balance. Use matching periods and definitions when discussing both in the same article.
ONS’s April 2026 research update explicitly distinguishes its published long-term migration methods from work exploring unauthorised migration. Do not assume that subtracting a boat count from an ONS total produces a verified count of “legal immigration”; the series are built for different purposes and are not a single additive ledger.
Why arrivals minus returns does not equal the population remaining
Returns are another flow. The Home Office methodology for returns distinguishes enforced returns, voluntary returns and people refused entry who subsequently depart. It also explains that small boat return statistics are dated by return, and the arrival need not have happened in the same period.
A calculation such as “arrivals since a selected year minus recorded returns equals the current unauthorised population” leaves out status grants, other departures and entries, deaths, repeated events and differences in coverage. Some people in a historical arrival cohort may now have permission to remain. A subtraction cannot resolve these missing movements or legal transitions.
Use a return statistic to describe the return activity it actually measures. A defensible cohort analysis would need linked records, a defined follow-up period, clearly stated outcomes and treatment of unmatched cases.
How to find the right source and check a headline
Start with the question rather than the largest available number. The official immigration-system data tables provide separate workbooks for entry routes, asylum, detention and returns. Use IER_01 for route totals, IER_02a for monthly small boat arrivals and vessels, and IER_02b for nationality. Keep the accompanying notes.
- Read the reference dates. Copy the exact start and end date; the page’s publication date alone is insufficient.
- Identify the unit. Is it a person, detection, vessel, application, decision, return or population estimate?
- Check coverage. Does the measure include unknown categories, dependants, undetected activity or only a selected route?
- Match the comparison. Compare equal periods from a consistent dataset. Do not sum overlapping rolling windows.
- Check the denominator. Ask what “88%” is a percentage of and whether missing records are excluded.
- Keep the version. Record the workbook edition and whether daily figures are provisional or quarterly figures have been revised.
- Separate outcomes from events. A historical arrival, a later asylum claim and current permission are distinct facts.
- Label uncertainty. A modelled historical range or research project should never be presented as a current official headcount.
For immigration announcements alongside statistical headlines, our immigration news source-checking checklist explains how to distinguish an announcement date from an implementation date. Verify the particular official release before using any figure for a report, campaign or personal decision.
Frequently asked questions
What are the latest official UK irregular migration figures?
The quarterly release published on 27 August 2026 records 38,086 detected arrivals via illegal entry routes for 1 July 2025 to 30 June 2026, including 33,374 small boat arrivals. These are entry-period figures, not a current resident-population estimate.
How many small boat arrivals were recorded in 2026?
The provisional daily series gives 22,605 recorded people on 328 boats from 1 January through 2 November 2026, calculated from the official time series and subsequent daily rows. This snapshot is incomplete for calendar 2026 and may be revised.
Is there an official total of illegal immigrants living in the UK?
No reliable current official population total is available. Entry detections, visa overstayers, asylum decisions and returns describe different parts of the system. Adding or subtracting these totals does not produce a valid headcount of people currently living without permission.
Are small boat arrivals and asylum claims the same number?
No. Arrival data use the arrival date, while asylum data use the claim date and may include dependants. People can claim asylum after entering through different routes, and a claim may occur in a later reporting period than the arrival.
Why do older websites show different annual arrival figures?
Official records can be revised, and pages may use different editions or reporting windows. Compare the workbook version, exact period and unit. The reviewed June 2026 workbook reports 45,774 small boat arrivals for calendar 2022; an older published value may differ.
Source and update note
This article interprets published statistics and does not determine anyone’s immigration status. Its figures were checked against the Home Office June 2026 quarterly release, the operational series available on 3 November 2026 and the linked methodology. New daily activity, later quarterly releases and revisions may change the figures. Check the source’s reference period before reusing them.