Full Services Private Investigation Agency
Independently audited 98.9% success rate (March 2026)
LOI Investigations is a Full Service Private Investigation Agency which specialises in all Private Investigation services, in Oxford, all of the UK and Worldwide. Our team includes both Male and Female Investigators who live in & cover all UK Counties and countries Abroad.
LOI Investigations are able to keep clients’ costs affordable. We provide a very high success rate and cater to private individuals businesses, corporates, VIPs and celebrities. From tracing missing persons in the UK & Worldwide to uncovering hidden assets, our private investigators are also experts in Fraud, divorce, separation and family issues.
Our expertise also includes Covert Surveillance, Problem Solving and Cyber Solutions. We are also well known for our ability to specialise in the most Difficult and Unusual Cases.
Our pricing structure also means that we are able to keep our services affordable, without detracting from the expertise and diligence that our Agency is renowned for, both in the U.K. and Abroad. Our Clients are our priority and no case is too small or complex.
Our Offices are locally staffed in 44 countries, with local, Bilingual, Private Investigators. Our Private Detectives are professional, qualified and fully insured. All of our investigators hold local licenses where applicable and therefore we have a complete global reach.
All Types of Investigations
LOI Investigations, guarantees absolute discretion and client confidentiality.
We are leaders in all types of investigations. We are particularly well known for our ability in obtaining accurate, hard to obtain hidden information legally, worldwide in total confidence.
UK : 0800 1 939 333
Worldwide : +44 800 1 934 999
FREE PHONE / TOLL FREE
WORLDWIDE
Qualified Professional Bilingual.
Private investigators available
24 hours per day, 7 days a week.
FREE CONSULTATION
Infidelity Investigations
LOI Investigations provides specialised infidelity investigation services in Oxford, offering solid evidence and peace of mind. Our expert private investigators use discreet surveillance techniques to uncover the truth. Get in touch with us for a confidential and thorough consultation.
Missing Persons Tracing
Searching for someone in Oxford or internationally? LOI Investigations offers expert missing persons tracing services, helping to locate lost friends, family members, or debtors. Our experienced team uses advanced investigative techniques to ensure a discreet and effective investigation.
Surveillance Services
At Line of Inquiry, our skilled surveillance team, which includes a former military intelligence officer and a senior surveillance expert with 23 years of experience, provides a wide range of services across Oxford and globally. Our mobile and static surveillance solutions, undercover operations, and use of advanced technology guarantee professional evidence collection tailored to your needs.
Cyber Security Investigations
Line of Inquiry offers specialist cyber security investigation services in Oxford to prevent cyberattacks and minimise damage. Using cutting-edge monitoring and intelligence techniques, our services include dark web monitoring, fraud detection, and identity theft investigations, safeguarding your business against potential cyber threats.
Phone Tracing Services
LOI Investigations provides GDPR-compliant mobile and landline phone tracing services globally. Whether registered, pay-as-you-go, or VOIP, our service confidentially retrieves information, including names, addresses, and related details.
Social Media & Online Harassment Investigations
LOI Investigations specialises in tackling social media and online harassment, including cyberbullying, threats, and racial abuse. Our team works with legal experts to trace online activity and assist in prosecuting offenders.
Asset Tracing and Recovery
LOI Investigations helps clients identify hidden assets such as bank accounts and real estate. Using OSINT, public records, and deep web searches, we provide a bespoke strategy for each case to ensure effective asset recovery.
Background Checks
Offering thorough and accurate background checks, LOI Investigations provides pre-employment screenings, criminal record verifications, and more. Our Oxford-based team ensures a fast and confidential service tailored to your needs.
Family Law & Relationship Issues
Line of Inquiry supports clients facing family issues and divorce in Oxford. We provide investigations into hidden assets, pre-divorce background checks, and post-separation surveillance, handling sensitive cases with discretion and professionalism.
Stolen Jewellery & High-Value Items Investigation
Our team of investigators is highly skilled in recovering stolen jewellery, art, and high-value items, both in Oxford and globally. We offer a high success rate in tracing and recovering valuable items for our clients.
Criminal Defence Investigations
With a proven track record in providing legal support, LOI Investigations offers expert criminal defence investigations in Oxford. We work with former police detectives and forensic experts to review evidence, reconstruct crime scenes, and re-examine case details.
Private Prosecutions
For private prosecutions, LOI Investigations offers legal assistance through our in-house solicitors and certified court enforcement officers, ensuring expert support throughout the process.
Blackmail Investigations
Our blackmail investigation services in Oxford are tailored to each case, whether involving corporate espionage, personal vendettas, or online threats. LOI Investigations uses advanced technology to resolve these matters effectively.
Mergers & Acquisitions Support
Considering a merger or acquisition? LOI Investigations offers comprehensive reports to evaluate financial, cybersecurity, and IP risks, ensuring that you make informed decisions before proceeding.
Catfishing Investigations
LOI Investigations offers detailed reports and expert investigators for catfishing cases in Oxford. We help identify false online identities, providing the evidence needed to protect yourself.
Construction Fraud Investigations
LOI Investigations is highly experienced in investigating construction fraud, having worked on over 20 successful projects. Our team can help minimise your exposure to these increasing risks.
Suspicious Death Investigations
LOI Investigations has extensive experience in investigating unsolved murders, suspicious deaths, and wrongful convictions. Our team, which includes forensic experts and retired police detectives, works to uncover the truth in these complex cases.
Business Intelligence Services
LOI Investigations offers a wide range of services for Oxford-based businesses, including competitive intelligence, asset tracing, and debtor investigations, employing advanced techniques to keep your business competitive and secure.
Intellectual Property Investigations
Specialising in intellectual property investigations since 1996, LOI Investigations works with legal counsel to provide reliable and actionable insights for protecting your intellectual assets.
Cyber Investigations
From catfishing to cryptocurrency investigations, LOI Investigations provides a comprehensive range of cyber investigation services to protect individuals and businesses from online threats.
Legal Support Services
LOI Investigations offers litigation support for civil and criminal cases in Oxford, working with legal teams to provide fraud investigations, asset tracing, and expert testimony.
Global Offices & 24/7 Availability
LOI Investigations offers 24/7 availability for in-person, phone, and virtual consultations. Schedule a meeting today to discuss your case.
Featured in Media
Building the Future
Have Achieved :
- Home office full criminal record cleared all employees
- Full Members of the Institute of Professional Investigators
- Fully Insured and Certified.
- Information Commissioner’s office (ICO)
Who We Are :
Line of Inquiry (LOI) has an impressive network of Cyber Investigators (Government Level trained), specialist unit surveillance experts and many other skilled experts. We have excellent, well-placed contacts throughout the world.
Line of Inquiry Head Office is 5 Chancery Lane, London WC2A 1LG, conveniently located in the heart of the Legal District and has further offices in London UK, Ireland, Monaco, Luxembourg, Switzerland, Norway, Sweden, Denmark, Finland, Cyprus-north & south, Malta, Germany, Netherlands, Washington, New York, The Hamptons, San Francisco, Los Angeles, Houston, Dallas, Denver, Florida, Toronto, Singapore, Hong kong, Macau, Malaysia-Kuala lumpur, Thailand, Cambodia, Vietnam, Taiwan, Japan, Indonesia, Bali, Qatar, Kuwait, Dubai, Saudi Arabia, South Korea, Kazakhstan, Uzbekistan, Kyrgyzstan, Sydney, Melbourne, Brisbane & Gold coast, Canberra.
Our business is to get you the information you require discreetly undetectably and in strict confidentiality.
More About Us
We are a group of highly experienced private investigators blending traditional trade-craft with modern investigation techniques. LOI is firmly established as one of the world’s leading Private Investigation consultancies, and all-round problem fixers.
The founder of our company, was also commissioned to write a report, translated into every FIFA (Fédération Internationale de Football Association) member’s language on Press Intrusion, privacy and protection.
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Achieved Credentials
We know how to legally trace emails, YouTube, Facebook, LinkedIn, and Instagram posts & comments, trace email and chat box enquiries.
Please call :
UK : 0800 1 939 333
Outside UK : +44 800 1 935 777
