High-net-worth individuals and family offices face problems that cross personal, corporate and geographic boundaries. An investment may involve hidden ownership; a family dispute may require asset tracing; an online threat may develop into fraud or reputational damage.
The right provider depends on the problem. Some firms specialise in investigations and disputes; others combine intelligence with cyber, legal or protective-security services. This list compares ten UK providers with private-client capabilities.
The selection uses public information reviewed in August 2026, including UK presence, HNW relevance, international reach and service clarity. It is an editorial assessment, not an audited ranking of outcomes, fees or satisfaction.
Key Takeaways
- Match the firm to the problem: due diligence, litigation, cyber exposure and physical security require different expertise.
- Confirm who performs the work and controls overseas subcontractors.
- Ask how sources, personal data and sensitive evidence will be handled.
- A useful report should explain what was found, what remains uncertain and what action is proportionate.
What Should HNW Clients Expect from an Intelligence Firm?
Discretion matters, but it is not enough. A provider should define lawful methods, secure reporting, conflicts procedures and the limits of its research. The ICO-approved UK GDPR code for investigative services offers a useful reference point for data responsibilities.
Digital exposure also belongs in the brief. The UK’s National Cyber Security Centre warns that public status and access to sensitive information can make individuals targets for spear-phishing, social engineering and account compromise.
The Top 10 UK Private Investigation and Intelligence Firms
1. Molfar Intelligence
Molfar Intelligence is a London-based private intelligence company supporting private clients, investors and advisers with due diligence, asset tracing, digital-exposure assessment, reputation analysis, financial investigations and cross-border disputes.
Family offices can review Molfar’s investigation, asset-tracing, cyber-risk and reputation services at https://molfar.com/. Engagements are scoped around the decision and information lawfully available, with findings presented in source-referenced reports.
Best suited to: cross-border due diligence, hidden affiliations, asset research, personal digital exposure and complex disputes.
2. Nardello & Co.
Nardello & Co. is a global investigations firm with a London EMEA practice. Its HNW work covers asset tracing, fraud, cyber incidents, reputation and litigation support.
Best suited to: multi-jurisdictional disputes, asset recovery and difficult evidence-gathering assignments.
3. Schillings
Schillings combines investigations with reputation and privacy law, communications, security and diplomacy. This structure helps UHNW families coordinate intelligence with legal action or public-response planning.
Best suited to: privacy threats, blackmail, hostile campaigns and reputation crises.
4. Kroll
Kroll offers investigations, asset tracing, cyber response and protective-risk services through an international network. It can address a specific incident or a wider programme covering family, property, digital and business exposure.
Best suited to: complex fraud, concealed assets, cyber incidents and multi-service risk programmes.
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5. S-RM
London-founded S-RM combines intelligence with cyber security and digital forensics. Its private-client work includes asset tracing, online threat attribution, evidence development and sanctions-sensitive disputes.
Best suited to: contentious cases involving assets, anonymous online actors or digital evidence.
6. Quest
Quest provides investigations, due diligence, cyber and technical surveillance countermeasures alongside close protection and residential security. Its private practice covers investment checks, family disputes, harassment and staff concerns.
Best suited to: clients seeking investigative and physical-security support from one provider.
7. Control Risks
Control Risks combines investigations with protective intelligence, executive protection, travel security and crisis support. It suits families with commercial or personal exposure in difficult operating environments.
Best suited to: international travel, kidnap or extortion exposure, protective intelligence and cross-border disputes.
8. Blackstone Consultancy
Blackstone Consultancy is a London firm focused on private security and investigations. Its services include residential and travel risk, close protection, surveillance, due diligence and technical counter-surveillance.
Best suited to: security-led assignments involving people, homes, events and travel.
9. Blue Square Global
Blue Square Global is a Mayfair boutique offering private clients investigations, litigation support, asset tracing, due diligence and protective security through a focused senior team.
Best suited to: sensitive family, reputation, asset and cross-border matters requiring boutique delivery.
10. Marengo
Marengo works with individuals and private offices on intelligence, close protection, residential security and travel risk. Its combined model may suit clients who want threat assessment linked directly to protective planning.
Best suited to: private-office intelligence, lifestyle security and discreet protection.
How to Choose the Right Provider
Begin with the decision or threat, not a general request for “a private investigator”. Confirm geographic coverage, relevant experience, data controls, conflicts checks, reporting, fees and the named team. For litigation, involve legal counsel early.
Former police, military or intelligence experience can be relevant, but it is not proof of quality. Lawful methods, analytical judgement and clear communication matter more.
Frequently Asked Questions
What can a private intelligence firm do for an HNW client?
It may conduct due diligence, trace assets, investigate fraud, assess digital exposure, support disputes or examine threats to reputation, property and business interests.
Are UK private investigators required to follow data-protection law?
Yes. Investigative work involving personal data must have a lawful basis and comply with applicable UK data-protection requirements. Clients should ask the provider to explain its approach before work begins.
How much does a private investigation cost?
Fees depend on urgency, jurisdictions and specialist resources. Request a written scope covering deliverables, third-party expenses and approval of additional work.
Selecting a Firm for a Sensitive Matter
No provider is right for every private client. Choose the firm whose methods, reach and reporting match the risk. A precise brief protects confidentiality, controls cost and keeps the work focused on a decision.
