What Are The Most Common Reasons Why Private Investigators Are Hired in the UK?

People usually hire a private investigator when they need reliable facts but cannot safely, discreetly or lawfully establish those facts themselves. The most common instructions involve suspected infidelity, tracing a person, child welfare concerns, employee misconduct, fraud, disputed insurance claims, missing witnesses, corporate due diligence, litigation support and suspected surveillance devices.

There is no authoritative national table ranking private investigation work by case type. The sector is diverse and, as of July 2026, there is still no dedicated Security Industry Authority licence for private investigators. A parliamentary inquiry previously suggested that as many as 10,000 people could be working in the field, while also acknowledging that nobody knew the precise number.^[1] Current SIA material lists the security activities it licenses, and private investigation is not one of the listed categories.^[2]

That does not mean private investigators operate outside the law. Investigative work must comply with the UK GDPR and the Data Protection Act 2018, as amended by the Data (Use and Access) Act 2025, together with other relevant English law. The Information Commissioner’s Office has approved a specific UK GDPR code of conduct for investigative and litigation support services, covering matters such as lawful bases, legitimate interests assessments, data minimisation and the handling of tracing enquiries.^[3][4]

The most common reasons to hire a private investigator

1. Suspected infidelity or dishonesty in a relationship
2. Tracing a debtor, relative, beneficiary, witness or former tenant
3. Checking a child’s welfare or concerning associations
4. Investigating employee misconduct, false absence or undeclared work
5. Examining suspected fraud, theft or dishonest business activity
6. Checking potentially exaggerated or fraudulent insurance claims
7. Locating witnesses and obtaining factual accounts
8. Carrying out corporate due diligence and background research
9. Supporting litigation and serving legal documents
10. Checking premises or vehicles for hidden tracking or listening devices

The right method depends on what needs to be proved, the information already available, the legal basis for the work and whether the proposed investigation is necessary and proportionate. At SPS Investigations, we assess each case individually before recommending a plan. Our private investigation services support individuals, businesses and solicitors across London and the Home Counties.

1. Suspected infidelity and relationship dishonesty

Relationship concerns are among the best-known reasons for hiring a private investigator. A client may have noticed unexplained absences, conflicting accounts, sudden changes in routine, secretive phone use or repeated overnight stays away from home. Suspicion alone can be emotionally exhausting, but confronting a partner without reliable information may make the situation worse.

Where it is lawful and proportionate, an investigator may use discreet surveillance from public places, timed observations and factual reporting to establish a person’s movements and meetings. The purpose should be clearly defined. It might be to confirm whether a stated work trip took place, whether a person attended a particular location or whether a recurring pattern exists.

Our surveillance and relationship investigation services are designed to establish facts discreetly. Readers may also find our guide to whether private surveillance is legal in England helpful.

2. Tracing debtors, relatives, beneficiaries and other individuals

People tracing is another major area of private investigation. Clients may need to locate a debtor who has moved without leaving a forwarding address, a former tenant, an estranged relative, the beneficiary of a will, a missing business contact or a witness connected to legal proceedings.

A lawful trace can involve checking information supplied by the client, searching open sources, reviewing public records, comparing address histories and verifying whether a possible match is current. The investigator should have a legitimate purpose for processing personal information and should avoid intrusive or deceptive methods.

We provide people tracing services for private, commercial and legal clients. A trace is not guaranteed, but the quality of the starting information often has a major effect on the prospects of success.

3. Child welfare concerns

A parent or close family member may become concerned about a child’s routine, the people they are spending time with, possible gang involvement, county lines exploitation, substance misuse or unsafe locations. In other cases, separated parents may have conflicting accounts of where a child is being taken or who is supervising them.

Private investigators do not replace the police, children’s services or the courts. Where there is an immediate risk of harm, the correct first step is to contact the emergency services or the relevant safeguarding authority. In suitable non-emergency cases, a carefully limited investigation may help establish a factual picture of movements, associates and locations visible from public places.

We explain this area in more detail in our guide to private investigator child welfare checks in the UK.

4. Employee misconduct and false absence

Businesses sometimes instruct private investigators when they suspect serious employee misconduct. Examples include working elsewhere while claiming sickness absence, theft, misuse of company vehicles, false mileage claims, unauthorised disclosure of confidential information, undisclosed competitor contact or serious breaches of contractual duties.

The employer should not begin with a broad instruction to monitor an employee indefinitely. Covert monitoring is especially intrusive. ICO guidance says it should be used only in exceptional circumstances, authorised at an appropriate senior level, supported by a data protection impact assessment and strictly targeted within a defined timeframe.^[6] Employers must also follow a fair internal process. Acas guidance explains that a workplace investigation should gather evidence from all sides, establish whether there is a case to answer and help the employer decide what should happen next.^[7]

Our corporate investigation services can be tailored to a defined employee conduct concern while keeping proportionality and evidence quality central to the work.

5. Fraud, theft and dishonest business activity

Fraud can affect individuals, small businesses, large companies, landlords, professional firms and public-facing organisations. The latest Crime Survey for England and Wales estimated 4.5 million incidents of fraud in the year ending March 2026.^[8] Not every fraud allegation requires a private investigator, but professional support can be useful when a client needs to establish connections, document conduct, identify assets or preserve a clear chronology.

An investigation may combine open-source intelligence, company and director research, witness enquiries, lawful surveillance, document analysis and address verification. The investigator should distinguish confirmed facts from allegations and should not present themselves as a police officer or claim powers they do not have.

We carry out corporate and fraud-related investigations for businesses that need clearer information before deciding how to respond.

6. Insurance claim investigations

Insurers, claims handlers, businesses and solicitors may instruct investigators where a claim appears inconsistent, exaggerated, staged or connected to a wider pattern. This can arise after a road traffic accident, an alleged workplace injury, property damage or another insured event.

The appropriate work might include confirming an incident location, tracing witnesses, reviewing public information, establishing links between parties or conducting limited surveillance where there is a clear and lawful justification. The ICO-approved investigations code includes an example involving an insurer examining potentially connected fraudulent road traffic accident claims, while stressing the need for an appropriate lawful basis and additional conditions when criminal offence data is processed.^[3]

Our surveillance and corporate investigation services can support proportionate insurance enquiries in London and the Home Counties.

7. Witness tracing and factual statements

Solicitors and private clients may know that a witness exists but no longer have a current address or reliable means of contact. A witness may have moved since an accident, business dispute, family matter or other event. Delays can make the trace harder as records and memories become less current.

An investigator can attempt to locate the witness, verify that the correct person has been found and ask whether they are willing to communicate with the instructing party or solicitor. Where requested and appropriate, an investigator may obtain a factual account or statement. A private investigator cannot compel a person to cooperate, attend court or provide evidence.

Our people tracing and investigation services can assist with witness location and initial contact.

8. Corporate due diligence and background research

Businesses may need more than a basic online search before entering a significant commercial relationship. Corporate due diligence can be useful when assessing a potential partner, supplier, contractor, senior appointment, acquisition target, investor or high-value customer.

The investigation can examine publicly available company records, directorships, insolvency information, trading history, adverse media, litigation indicators, connected entities and inconsistencies in claims made during negotiations. Any background checking must be relevant to the decision, based on a lawful purpose and limited to information that is necessary.

We use our corporate investigation services to help businesses make decisions with a clearer understanding of the people and entities involved.

9. Litigation support and process serving

Private investigators are often instructed by solicitors, companies and individuals before or during civil proceedings. The Ministry of Justice recorded an estimated 526,666 civil claims in the three months to 31 March 2026, illustrating the scale of civil court activity in England and Wales.^[9]

Investigation support may include tracing a defendant, locating a witness, documenting a site or pattern of conduct, carrying out factual enquiries, building a chronology or serving legal documents in accordance with the relevant rules and instructions. Early involvement can be useful where evidence may disappear, an address is uncertain or a witness is becoming difficult to contact.

Our process serving, tracing and litigation support services can be adapted to the needs of the case and the solicitor’s instructions.

10. Suspected tracking devices, cameras or listening equipment

Some clients contact private investigators because they believe a vehicle, office, meeting room or home may contain an unauthorised tracker, camera or listening device. Concerns can arise during relationship breakdowns, commercial disputes, executive security issues or suspected corporate espionage.

A technical counter-surveillance inspection, often called a bug sweep, uses specialist equipment and a physical examination to look for suspicious devices or signs of tampering. The scope should be agreed with the lawful owner or authorised occupier of the premises or vehicle. Investigators should not interfere with property they have no authority to inspect.

Our bug sweep and counter-surveillance services help clients assess suspected technical surveillance discreetly.

Speak to SPS Investigations confidentially

We provide private investigation services to individuals, businesses and solicitors across London and the Home Counties. Whether your concern involves a relationship, a missing person, employee conduct, fraud, a witness or pending litigation, we can assess the information you already hold and explain what a lawful investigation may realistically achieve.

To discuss your situation in confidence, get in touch with SPS Investigations.

This article provides general information about private investigation in England and is not legal advice. Where court proceedings, employment action, safeguarding or suspected criminal conduct is involved, obtain advice from an appropriately qualified professional.