Illegal immigration to the United Kingdom

Unauthorised entry or residence in the United Kingdom

It is difficult to measure how many people reside in the UK without authorisation, although a Home Office study based on Census 2001 data released in March 2005 estimated a population of between 310,000 and 570,000.[1][2] The methods used to arrive at a figure are also much debated.[3] Problems arise in particular from the very nature of the target population, which is hidden and mostly wants to remain so.[4] The different definitions of 'illegality' adopted in the studies also pose a significant challenge to the comparability of the data. However, despite the methodological difficulties of estimating the number of people living in the UK without authorisation, the residual method has been widely adopted.[5][6][2] This method subtracts the known number of authorised migrants from the total migrant population to arrive at a residual number which represents the de facto number of illegal migrants.[7]

A study carried out by a research team at LSE for the Greater London Authority, published in 2009, estimated the illegal migrant population of the UK by updating the Home Office study.[6] The LSE's study takes into account other factors not included in the previous estimate, namely the continued arrival of asylum seekers, the clearance of the asylum applications backlog, further illegal migrants entering and leaving the country, more migrants overstaying, and the regularisation of EU accession citizens.

The most significant change in this estimate is, however, the inclusion of children born in the UK to illegal immigrants. For the LSE team illegal migrants oscillate between 417,000 and 863,000, including a population of UK-born children ranging between 44,000 and 144,000. Drawing on this and taking stock of the outcome of the recent Case Resolution Programme,[8] a University of Oxford study by Nando Sigona and Vanessa Hughes estimated at the end of 2011 a population of illegal migrant children of 120,000, with over half born in the UK to parents residing without legal immigration status.[9] A Greater London Authority funded study by researchers at the University of Wolverhampton's Institute for Community Research and Development updated these figures in 2020, and estimated that the figure in April 2017 was between 594,000 and 745,000[5] including between 191,000 and 241,000 children.[5] A January 2025 study commissioned by Thames Water to identify "hidden" and "transient" users of water, suggested that London is home to as many as 585,000 illegal migrants, the equivalent to one in twelve of the city's population.[10]

## Definitions

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According to the House of Commons Library, several definitions for a migrant exist in United Kingdom so that a migrant can be:

* Someone whose country of birth is different to their country of residence.
* Someone whose nationality is different to their country of residence.
* Someone who changes their country of usual residence for a period of at least a year, so that the country of destination effectively becomes the country of usual residence.[11]

Illegal immigrants in the UK include those who have:

* entered the UK without authority
* entered with false documents
* overstayed their visas
* worked or studied on a tourist visa/ non-immigrant visa waiver
* entered into forced or fraudulent marriage[12][13][14]
* had their marriages terminated or annulled

## Political reaction

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Migration Watch UK, a think tank opposed to a large scale of immigration,[15] has criticised the Home Office figures for not including the UK-born dependent children of illegal migrants. They suggested in 2007 that the Home Office had underestimated the numbers of illegal migrants by between 15,000 and 85,000.[16]

Jack Dromey, Deputy General of the Transport and General Workers Union and Labour Party treasurer, suggested in May 2006 that there could be around 500,000 illegal workers. He called for a public debate on whether an amnesty should be considered.[17] Former Home Secretary David Blunkett suggested that this might be done once the identity card scheme is rolled out.[18] However the scheme was scrapped due to its widespread unpopularity by the coalition government in 2010.

London Citizens, a coalition of community organisations, is running a regularisation campaign called Strangers into Citizens, backed by figures including the leader of the Catholic Church in England and Wales, the Cardinal Cormac Murphy-O'Connor.[19] Analysis by the Institute for Public Policy Research suggested that an amnesty would net the government up to £1.038 billion per year in fiscal revenue.[20] However, analysis by MigrationWatch UK suggests that if the migrants granted amnesty were given access to healthcare and other benefits, the net cost to the exchequer would be £5.530 billion annually.[21]

In February 2008, the government introduced new £10,000 fines for employers found to be employing illegal immigrants where there is negligence on the part of the employer, with unlimited fines or jail sentences for employers acting knowingly.[22] In November 2008, the then Mayor of London, Boris Johnson, commissioned a study into a possible amnesty for illegal immigrants, citing larger tax gains within the London area which is considered to be home to the majority of the country's population of such immigrants.[23] It was suggested in 2009 that to deport all of the irregular migrants from the UK would take 20 years and cost up to £12 billion.[24]

In July 2013, the Home Office introduced an advertising lorry in London with its billboard saying "In the UK illegally? — GO HOME OR FACE ARREST — Text HOME to 78070 for free advice, and help with travel documents. We can help you return home voluntarily without fear of arrest or detention." This campaign was criticised by Vince Cable, a minister in the governing coalition, who called it "stupid and offensive".[25] Nigel Farage of the UK Independence Party criticised the campaign as "nasty" and suggested that its real message was "Please don't vote UKIP, we're doing something".[26]

In 2015, the newly-elected Conservative Government announced it would be requiring landlords to confirm the immigration status of tenants. Those failing to do so, or knowingly or unknowingly housing illegal immigrants could face criminal prosecution. This policy is called "Right to Rent", part of the Hostile Environment.[citation needed]

In 2015, a large number of migrants had set up a camp at Calais in the hope of entering the UK illegally, although there have always been some migrants entering the UK illegally from here many illegal migrants or asylum seekers try to enter the UK from France, by hiding inside trucks or trains and they've done so for years.[27] This sparked a large political debate in the UK. The UK government responded by funding additional security measures in Calais including a £7 million fence to prevent migrants entering the UK.[citation needed]

In January 2025, the UK implemented a pioneering sanctions regime targeting people smugglers by cutting off the illicit financial support that sustains their activities. The initiative, announced by David Lammy, includes measures such as asset freezes and travel bans, alongside a £150 million-funded Border Security Command to boost surveillance and intelligence efforts. While the move was praised as bold, critics questioned its effectiveness, pointing to a 25% rise in crossings in 2024. Priti Patel condemned the government's decision to abandon the Rwanda deportation scheme, raising doubts about the overall impact on curbing illegal migration.[28]

## Channel illegal immigrants

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Further information: English Channel migrant crossings (2018–present)

There is significant public concern about illegal immigrants coming on small boats from France. The UN convention on refugees[clarification needed][Convention Relating to the Status of Refugees?] permits entry by an illegal route, despite the word 'illegal' implying a criminal offence has been committed.[citation needed] Approximately 45,000 people arrived on small boats in the calendar year 2022.[29] In the year ending March 2023, almost half of small boat arrivals were from two nationalities: Albanians (28%) and Afghans (20%).[30]

On 18 July 2023, the United Nations criticised the UK's Illegal Migration Bill for violating international law and endangering refugees. The bill aims to curb boat arrivals and transfer migrants to countries like Rwanda, despite concerns over Rwanda's safety status.[31] Simon Murray, the undersecretary of state for the Home Office, defended the bill, saying the nation's asylum system and budget were overwhelmed and that removing the possibility of staying in the UK is the only way to prevent smugglers from exploiting would-be migrants. Some individuals argue that allowing asylum seekers to make an application before travelling to the UK would make the people smugglers' services redundant, however this application would not result in the creation of alternative, legal routes not involving smugglers.[32]

## Deaths

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A report in 2020 found that almost 300 people had died crossing the English Channel on small boats in the twenty years prior.[33] In November 2021 at least 27 people drowned during one crossing attempt.[34][35]

In October 2019 in a single incident, 39 migrants from Vietnam suffocated together in a lorry trailer travelling from Belgium to Essex. The Vietnamese leader of the smuggling gang was jailed in Belgium while a Romanian smuggler of the ring was sentenced at the Old Bailey.[36][33]

## See also

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* Demographics of the United Kingdom
* "Go Home" vans
* Immigration to the United Kingdom since 1922
* List of sovereign states and dependent territories by fertility rate
* MigrationWatch UK
* UK Visas and Immigration
* Calais Jungle
* Dunki a 2023 Indian film based on illegal immigration to the United Kingdom.

## References

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1. ^ Casciani, Dominic (14 June 2006). "An illegal immigration amnesty?". BBC News.
2. ^ a b Woodbridge, Jo (2005). "Sizing the unauthorised (illegal) migrant population in the United Kingdom in 2001" (PDF). Retrieved 14 March 2022.
3. ^ "Irregular Migration in the UK: Definitions, Pathways and Scale". The Migration Observatory. University of Oxford. 11 July 2011. Archived from the original on 12 April 2011. Retrieved 22 August 2012.
4. ^ Sigona, Nando (February 2012). "'I have too much baggage': the impacts of legal status on the social worlds of irregular migrants". Social Anthropology. 20 (1): 50–65\. doi:10.1111/j.1469-8676.2011.00191.x.
5. ^ a b c Jolly, Andrew; Thomas, Sian; Stanyer, James (2020). "London's Children who are not British Citizens: A Profile" (PDF). Greater London Authority. Retrieved 14 March 2020.
6. ^ a b Gordon, Ian; Scanlon, Kathleen; Travers, Tony; Whitehead, Christine (May 2009). "Economic impact on the London and UK economy" (PDF). GLA Economics. Greater London Authority. Archived from the original (PDF) on 15 September 2015.
7. ^ Pinkerton, Charles (2004). "Sizing the illegally resident population in the UK" (PDF). ONS. Retrieved 14 March 2020.
8. ^ "Case Resolution Directorate – Priorities and Exceptional Circumstances" (PDF). UK Visas and Immigration. Home Office. Archived from the original (PDF) on 10 January 2014.
9. ^ "Undocumented Migrant Children in the UK – COMPAS". Compas. University of Oxford. Archived from the original on 4 March 2016. Retrieved 22 August 2012.
10. ^ Davison, Tamara (23 January 2025). "Up to one in 12 people living in London is an illegal migrant, according to report". Evening Standard. Retrieved 14 February 2025.
11. ^ Sturge, Georgina (31 May 2023). "Migration Statistics". House of Commons.
12. ^ "Woman with IQ of 49 'was targeted for sham marriage'". The Independent. 29 June 2019.
13. ^ "Sham marriage gang jailed". www.gov.uk.
14. ^ "Couple jailed over South London sham marriage". www.gov.uk.
15. ^ "What is the problem?". Migration Watch UK.
16. ^ The illegal Migrant Population in the UK Archived 18 October 2007 at the Wayback Machine Migration Watch UK, Briefing paper 9.15,Migration Trends.
17. ^ Amnesty call over illegal workers BBC News, 20 May 2006.
18. ^ Blunkett: Immigration amnesty on cards[usurped] epolitix.com, 14 June 2006
19. ^ Joe Boyle, Migrants find a voice in the rain, BBC News, 7 May 2007, accessed 21 May 2007
20. ^ "Jacqui Smith should back amnesty for illegal workers". Institute for Public Policy Research. 15 July 2007. Archived from the original on 26 June 2009. Retrieved 5 May 2009.
21. ^ "The true cost of an amnesty for illegal immigrants". MigrationWatch UK. 30 August 2007. Archived from the original on 28 January 2013. Retrieved 5 May 2009.
22. ^ Richard Ford (29 February 2008). "£10,000 fines for employing illegal migrant without check". The Times. London. Archived from the original on 25 July 2008. Retrieved 22 March 2008.
23. ^ "Johnson ponders immigrant amnesty". BBC News. 22 November 2008. Retrieved 24 November 2008.
24. ^ "Tighter immigration controls could enable an amnesty for illegal immigrants say IPPR". Institute for Public Policy Research. 3 May 2009. Archived from the original on 26 June 2009. Retrieved 5 May 2009.
25. ^ "Vince Cable attacks crackdown on illegal immigrants as 'stupid and offensive'". Metro. 28 July 2013. Retrieved 7 August 2013.
26. ^ Dominiczak, Peter (25 July 2013). "Nigel Farage attacks 'Big Brother' Government immigration campaign". Telegraph. London. Retrieved 7 August 2013.
27. ^ Halliday, Josh (31 July 2015). "Cameron chairs Cobra meeting after overnight standoff in Calais". The Guardian.
28. ^ Brown, Faye (8 January 2025). "UK to introduce 'world first' sanctions regime to target people smugglers". The Independent. Retrieved 15 January 2025.
29. ^ "UK Home Office". Irregular migration to the UK. Retrieved 15 July 2023.
30. ^ "Irregular migration to the UK, year ending March 2023". GOV.UK. Retrieved 15 July 2023.
31. ^ Manas, Joshi (18 July 2023). "As UK passes illegal migration bill, UN says it is against international law". WION. Retrieved 18 July 2023.
32. ^ Melley, Brian (18 July 2023). "A vessel to accommodate asylum-seekers docks in UK as Parliament passes controversial migration bill". Associated Press News.
33. ^ a b Quinn, Ben (14 December 2022). "A timeline of migrant Channel crossing deaths since 2019". The Guardian. ISSN 0261-3077. Retrieved 17 October 2023.
34. ^ "Boris Johnson holds emergency Cobra meeting after Channel deaths". www.channel4.com. 24 November 2021. Retrieved 25 November 2021.
35. ^ Henley, Jon (25 November 2021). "Pregnant woman and three children among 27 drowned in Channel". The Guardian. Archived from the original on 25 November 2021. Retrieved 3 June 2025.
36. ^ "Smuggler sentenced to prison for deaths of 39 Vietnamese migrants who suffocated in truck in UK". AP News. 11 July 2023. Retrieved 17 October 2023.

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Illegal immigration by country

* Angola
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* Bangladesh
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* Finland
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* Greece
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* India
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* Israel
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* Mexico
* Nigeria
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* Singapore
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* South Korea
* Syria
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* United Kingdom
* United States
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