Authored By: Tania Janan
University of Northampton
Introduction
This article argues that human trafficking in the United Kingdom constitutes a distinct and complex form of organised crime, one that challenges traditional policing models and exposes structural weaknesses in current investigative and safeguarding practices. While UK law enforcement is tasked with both protecting victims and prosecuting offenders, evidence shows that these goals frequently conflict in practice. Human trafficking investigations require officers to make rapid decisions about risk, victim engagement, and evidential strategy, often in circumstances where victims are traumatised, fearful, or criminally exploited. [1]
The article proceeds as follows. Section II outlines the UK’s legal framework governing human trafficking, with reference to the Modern Slavery Act and related organised crime legislation. Section III examines the operational and evidential challenges that trafficking presents for investigators, including risk assessment, victim cooperation, and intelligence gaps. Section IV analyses recent policing practices and official reports to evaluate the effectiveness of current approaches. Section V proposes recommendations to strengthen investigative decision-making and improve victim‑centred responses within the UK policing context.
II- Uk’s legal framework
Pre‑Modern Slavery Act Trafficking Offences
The case of R v K [2011] EWCA Crim 1691 highlights the real-world challenges and shortcomings of the United Kingdom’s approach to trafficking before the Modern Slavery Act. At the time, laws under section 4 of the Asylum and Immigration (Treatment of Claimants) Act 2004 made it difficult for courts to agree on what legally counted as “exploitation,” which in turn made reliable convictions hard to achieve. This case made clear that the legal framework was not fit for purpose and that changes were needed to better protect victims and bring traffickers to justice.
The Court of Appeal overturned K’s conviction because the trial judge failed to explain what slavery, servitude, and forced labour really mean under Article 4 of the European Convention on Human Rights. Instead, the judge focused only on the pay and working conditions, missing the bigger picture. This narrow way of looking at the law showed how earlier trafficking offences were unclear and scattered across different rules, making it tough for courts to go after those organising and profiting from exploitation.
The Modern Slavery Act 2015 fixed many of these problems by bringing all trafficking offences together under one clear law in section 2. This law gave a straightforward, internationally recognised definition of exploitation, making it easier for courts and police to spot and tackle organised crime and coercion. As a result, R v K is now an important reminder of how confusion in old laws made it hard to go after traffickers, and how those challenges pushed lawmakers to create the stronger legal protections we have today.[2]
Modern slavery Act 2015
Section 2 of the Modern Slavery Act 2015 creates a single, consolidated offence of human trafficking, covering both sexual and non‑sexual exploitation. The provision makes it a criminal offence to arrange or facilitate the travel of another person with the intention that they will be exploited, or where the offender knows or ought to know that someone else is likely to exploit the victim.
The Act makes clear that victim consent is irrelevant: trafficking is defined by movement and subsequent exploitation, not by whether the victim agreed to travel. Travel includes entering, leaving, or moving within any country, and can be facilitated through recruiting, transporting, transferring, harbouring, receiving, or exchanging control over a person. These definitions mirror international instruments such as the Palermo Protocol and the Council of Europe Convention.[3]
Section 2 has broad territorial reach. UK nationals can be prosecuted for trafficking offences committed anywhere in the world. Non‑UK nationals can be prosecuted if any part of the arranging or facilitating occurs within the UK, or if the victim’s travel involves entering, leaving, or moving within the UK.
The offence replaces earlier trafficking provisions in the Sexual Offences Act 2003 and the Asylum and Immigration (Treatment of Claimants) Act 2004, simplifying the law and ensuring consistency across all forms of exploitation. The section is supported by related provisions on penalties, sentencing, asset confiscation, and victim identification found elsewhere in the Act.
Overall, Section 2 establishes a comprehensive and internationally aligned definition of human trafficking, enabling UK authorities to prosecute organised criminal networks involved in the movement and exploitation of victims.[4]
Serious Crime Act 2015
Section 45 of the Serious Crime Act 2015 creates a specific offence for individuals who contribute to organised crime groups. The offence applies when someone participates in activities they know or reasonably suspect are connected to such a group or will assist it in criminal conduct. Criminal activities are defined broadly to include serious offences punishable by at least 7 years in England and Wales, as well as similar offences in other jurisdictions.
An organised crime group is defined as three or more individuals acting together to commit criminal activities. The offence does not require the defendant to know the identities of other group members or for all participation to occur within England and Wales. The group’s benefit may extend beyond financial gain.
The section provides a limited defence: an individual is not guilty if they can show their participation was necessary to prevent or detect crime. The maximum penalty is five years’ imprisonment, reflecting Parliament’s intent to criminalise not only principal offenders but also those who support or enable organised criminal networks.[5]
Immigration Act 2016
A person cannot work if they do not have permission to enter or stay in the UK, if their permission has expired or been cancelled, or if their permission does not allow the type of work they are doing. This offence applies to many kinds of work, such as regular jobs, apprenticeships, service contracts, Crown jobs, and roles in Parliament.
This offence can lead to prison or a fine. Prosecutors also must consider confiscating any money earned through illegal activity under the Proceeds of Crime Act 2002. The law also makes it clear that immigration bail conditions count as conditions of leave when deciding if someone has worked illegally.
Section 34 significantly strengthens the UK’s response to labour exploitation not only by criminalising illegal working but also by facilitating financial investigations into offenders. The criminalisation of illegal working is particularly relevant in the context of human trafficking cases, since trafficked individuals are frequently compelled to work without legal authorisation. However, there is ongoing debate over whether criminalising illegal working sufficiently addresses victims’ underlying vulnerabilities. Critics argue that prosecution may further marginalise trafficked individuals, deterring them from seeking assistance, whereas proponents suggest it is a necessary deterrent against organised labour exploitation syndicates. Thus, while illegal working is often indicative of broader patterns of organised exploitation, the effectiveness of section 34 in protecting victims as opposed to solely prosecuting offenders requires careful, ongoing evaluation.
III- Human Trafficking as Organised Crime: Operational & Evidential Challenges
This section will cover key analytical themes:
Organised crime structure in trafficking networks
This article argues that human trafficking in the UK should be understood as an integral part of the wider organised crime landscape, rather than as the work of isolated offenders. A comprehensive understanding of human trafficking as organised crime requires recognising that traffickers operate within broader criminal ecosystems, not in isolation. The Merseyside study by Campana and Giovannetti provides strong evidence for this view. As the authors note, “no person is an island, and neither are organised crime groups (OCGs),” showing that exploitation thrives when criminal groups collaborate, share resources, and reinforce each other’s activities. Their analysis of cooperation among 134 OCGs shows that trafficking networks are embedded within larger organised crime clusters, especially those linked to drug markets. The study identifies a “strong tendency towards clusterisation,” meaning criminal groups form selective partnerships to better control markets, transport illicit goods, and manage risk. This structure reflects trafficking networks, which rely on loose, adaptable alliances rather than rigid hierarchies.
Importantly, drug trafficking is the only revenue-generating activity with a clear structuring effect on cooperation. In the UK, many trafficking networks overlap with drug supply chains, sharing transportation routes, safe houses, forged documents, and financial infrastructures. The research also shows that groups with greater centrality in cooperation networks are more likely to use violence, highlighting that coercion and intimidation are key tools for maintaining criminal authority. For victims, this means exploitation is driven not by isolated offenders but by interconnected groups whose collaboration boosts their ability to recruit, control, and profit.
These findings carry important implications for policy and law enforcement: understanding human trafficking as a networked phenomenon embedded within organised crime underscores the need for integrated, multi-agency responses. Interventions should target criminal collaborations and the shared infrastructures that enable trafficking, rather than focusing narrowly on individual offenders. The Merseyside evidence supports viewing human trafficking in the UK as part of a broader organised crime landscape, defined by networks, shared criminal markets, and relational power rather than isolated actors.[6]
Evidential Challenges for Investigators
Investigating human trafficking in the UK is incredibly challenging, especially because so many victims are unable or unwilling to take part in criminal proceedings. Many are too traumatised, fear retaliation, or simply don’t trust the authorities. Traffickers often threaten their victims, making it hard for them to cooperate. As a result, police and prosecutors are forced to build cases without the benefit of reliable victim testimony.
This lack of cooperation makes it much harder to meet the legal requirements for proving trafficking under the Modern Slavery Act 2015. A key part of the law is showing that the offender acted with the intention to exploit someone, but that can be extremely difficult when victims are too frightened or ashamed to share their experiences. On top of this, information about trafficking is often scattered between police forces, immigration officials, local councils, and safeguarding agencies. These gaps mean investigators rarely get the full picture of how organised exploitation works.
Another big challenge is that trafficking usually crosses borders. Collecting evidence from other countries—like witness statements, travel records, financial documents, or proof of recruitment—means relying on foreign authorities. This process is often slow and complicated by different legal systems, leaving investigators with incomplete evidence and limited support from victims. All of this adds up to a situation where tackling organised crime is an uphill struggle, made even harder by the many barriers to international cooperation.[7]
Conflict Between Safeguarding and Prosecution
UK case law and official reports reveal an ongoing struggle between protecting victims and prosecuting crimes in trafficking investigations. Too often, those who have been exploited are treated as criminals themselves—especially in cases involving cannabis cultivation, shoplifting, or immigration offenses—because authorities fail to recognize signs of exploitation in time. In the landmark case of VCL & AN v UK, the European Court of Human Rights ruled that the UK did not do enough to safeguard trafficked children who ended up being prosecuted, even when there was clear evidence, they were victims. The court criticized the British authorities for not giving adequate reasons for pursuing prosecution in these cases.[8]
Similarly, in R. v .SK, the Court of Appeal quashed a trafficking conviction after identifying a misdirection on the elements of exploitation. This case shows that misunderstandings of trafficking law can lead to unsafe convictions.[9] The 2021 conjoined appeals made it clear that courts need to carefully consider if someone committed an offence because they were forced by traffickers. It’s important to show a clear connection between being exploited and breaking the law. Official UK guidance and reports point out that there are ongoing challenges: investigators should focus on keeping victims safe, but at the same time, prosecutions often depend on victims telling their stories. This makes it difficult to balance protecting people right away with gathering enough evidence for a case later. Problems like missing information, poor data sharing between agencies, and difficulties collecting evidence from other countries make things even harder. These issues can leave victims more vulnerable and make cases weaker.
Policing Practices, Institutional Weaknesses, and Systemic Failures
Persistent structural failures have seriously weakened the United Kingdom’s response to human trafficking, making it much easier for organised exploitation to go on without being stopped. When the Modern Slavery & Organised Immigration Crime Unit (MSOICU) was closed, police forces lost a vital national hub for sharing information and coordinating strategies.
Analysis by the Rights Lab shows this made it much harder for the UK to track and disrupt trafficking networks. As a result, agencies working together are less effective, and the country’s ability to respond to trafficking has dropped.
Another gap is the limited use of Slavery and Trafficking Prevention and Risk Orders (STPOs/STROs). These orders are meant to keep high-risk offenders in check, but both the Home Office and the Independent Anti-Slavery Commissioner say they’re rarely used. This has led to calls for new laws to make these orders more common and to improve how known traffickers are monitored.
There are also big problems within the National Referral Mechanism (NRM), the system used to identify and support trafficking victims. The number of referrals jumped from 3,263 in 2015 to 16,938 in 2022, but the Home Affairs Committee estimates there could be up to 100,000 victims in the UK. This shows the system is missing a lot of people who need help.
The Committee has found that exploitation isn’t the same for everyone. Men are affected more by forced labour and criminal exploitation, while women are more likely to be victims of sexual exploitation. A lack of support for victims makes things worse, especially for children, who make up a third of all NRM referrals.
Reports, like those from GRETA, show that migrant workers, asylum seekers, homeless people, and LGBTI individuals are especially at risk. Support for victims is often short-term, inconsistent, and not well organised. All these problems together mean the system is overwhelmed, intelligence is scattered, and safeguarding isn’t working well—so organised trafficking networks are able to carry on with little interference.[10]
Recommendations for Strengthening Prevention and Prosecution
Effectively combating human trafficking in the United Kingdom requires a decisive shift from fragmented and reactive policing to a well-coordinated, intelligence-led, and victim-centred strategy. Collaboration among the police, National Crime Agency, immigration authorities, local councils, and safeguarding organisations is critical to closing gaps that traffickers routinely exploit. Presently, the lack of consistent information sharing and joint operations allows organised criminal groups to operate with relative impunity (HM Government, 2021).
Re-establishing or replacing the Modern Slavery and Organised Immigration Crime Unit (MSOICU) is vital for restoring national strategic oversight and facilitating effective intelligence sharing between agencies. The disbandment of the MSOICU has been linked to diminished national capacity for disrupting trafficking networks and coordinating multi-agency responses (Rights Lab, 2023).
Frontline officers require mandatory, trauma-informed training to recognise the complex psychological effects of trafficking, including fear, coercion, and mistrust of authorities. Implementing sensitive and empathetic interviewing techniques is essential to foster trust, encourage victim disclosure, and minimise the risk of retraumatisation (GRETA, 2022).
Enforcement mechanisms should be strengthened through greater use of Slavery and Trafficking Prevention Orders (STPOs) and Slavery and Trafficking Risk Orders (STROs). Despite their proven potential to prevent recidivism, these tools remain underutilised. Legislative and operational reforms are necessary to ensure their consistent application and monitoring across all police jurisdictions (Independent Anti-Slavery Commissioner, 2022).
Comprehensive, long-term support for survivors is essential. Beyond immediate crisis intervention, victims require stable housing, ongoing mental health care, financial assistance, and clarity regarding their immigration status. Such support not only promotes recovery but also reduces the risk of re-trafficking and fosters greater engagement with the criminal justice process (Home Affairs Committee, 2023).
Law enforcement agencies should prioritise financial investigations to identify, disrupt, and confiscate the profits sustaining trafficking operations. Targeting the financial foundations of organised crime is a proven strategy for dismantling complex criminal networks (Proceeds of Crime Act 2002).
The United Kingdom should enhance international cooperation with partners such as Europol, Eurojust, and Interpol. Improved intelligence sharing, the creation of joint investigation teams, and more efficient cross-border evidence gathering are critical for disrupting transnational trafficking networks (Europol, 2022).
Collectively, these reforms would significantly enhance the United Kingdom’s capacity to prevent trafficking, strengthen enforcement, dismantle organised criminal networks, and provide more effective protection and support for survivors.
Conclusion
Human trafficking in the United Kingdom remains a serious and deeply rooted problem. It is not just a crime carried out by organised groups—it also exposes ongoing weaknesses in the country’s laws, policing, and systems designed to protect victims. Before the Modern Slavery Act (MSA) of 2015, the legal approach to tackling these crimes was fragmented. The MSA brought much-needed clarity, making it easier to identify victims and hold offenders to account. Yet, even with these improvements, police and investigators still face major challenges. Many victims are so traumatised that they cannot safely tell their stories. Important information is often spread out across different agencies, making it hard to put the whole picture together. Because these crimes often cross borders, investigations are even more complicated. Court cases show that there is still a difficult balance between protecting victims and prosecuting criminals. Sometimes, the system mistakes those who have been forced into crime for the very people it should be helping.
Looking at how the system works, there are still gaps that let organised trafficking networks continue. For example, closing national coordination units, not using prevention orders enough, and putting too much pressure on the National Referral Mechanism all make it easier for traffickers to operate. This study shows just how important it is for agencies to share information, for police to understand and respond to victims’ trauma, and for victims to get support for as long as they need it. There also needs to be better monitoring of how organised crime works. Overall, the findings make it clear: real progress is only possible if everyone involved works together, keeps the focus on victims, and makes sure support and prosecution efforts are joined up and consistent.
Bibliography
Cases
R v K [2011] EWCA Crim 1691
R v SK [2011] EWCA Crim 1691
VCL and AN v United Kingdom (2021) ECHR 16 February 2021, Applications 77587/12 and 74603/12
Legislation
Modern Slavery Act 2015, s 2
Serious Crime Act 2015, s 45
Journal Articles
Pajon L and Walsh D, ‘Investigating organised human trafficking crimes: case studies of police investigations in England’ (2025) 26 Police Practice & Research 136–152
Campana P and Giovannetti A, ‘The structure of cooperation among organized crime groups: A network study of Merseyside, UK’ (2025) 96 Journal of Criminal Justice 102348
Government Reports / Websites
HM Government, ‘Modern slavery: how to identify and support victims’ (Gov.uk, 24 March 2020) <https://www.gov.uk/government/publications/modern-slavery-how-to-identify-and-support-victims> accessed 21 July 2026
Home Office, Independent Review of the Modern Slavery Act: Final Report (22 May 2019) <https://www.gov.uk/government/publications/independent-review-of-the-modern-slavery-act-final-report> accessed 21 July 2026
[1] Pajon Laura, Walsh Dave, ‘Investigating organised human trafficking crimes: case studies of police investigations in England’ [2025] [136-137]
[2] R v K [2011] EWCA Crim 1691, [37-48]
[3] Modern Slavery Act 2015, s. 2 Human trafficking s.b (1-4)
[4] Modern Slavery Act 2015, s. 2 Human trafficking
[5] Serious Crime Act 2015 s.45
[6] Campana and Giovannetti, ‘The structure of cooperation among organized crime groups: A network study of Merseyside, UK’ (2025) 96 Journal of Criminal Justice 102348.
[7] ‘Modern slavery: how to identify and support victims’ (Govuk, 24 March 2020) <https://www.gov.uk/government/publications/modern-slavery-how-to-identify-and-support-victims> accessed 21 July 2026
[8] VCL and AN v United Kingdom (2021) ECHR 16 February 2021, Apps 77587/12 and 74603/12.
[9] R v SK [2011] EWCA Crim 1691
[10] Home Office, Independent Review of the Modern Slavery Act: Final Report (22 May 2019) https://www.gov.uk/government/publications/independent-review-of-the-modern-slavery-act-final-report accessed 21 July 2026.
