Private investigators help people and businesses get clear answers in a professional and private way. The right investigator will gather evidence legally and keep everything secret, whether it’s for corporate fraud, a missing person, surveillance, or a personal issue.
We’ve made a list of the ten best private investigation agencies in the UK for 2025 to make things easy. We choose these businesses because they have a lot of experience, are trustworthy, and have shown results. This guide makes it easy to find a reliable investigator, whether you are a business protecting your assets or a person looking for peace of mind.
| # | Agency Name | Location | Services Covered | Industries Served | ⭐ Rating |
|---|---|---|---|---|---|
| 1 | Private Investigations UK (PIUK) | Nationwide | Surveillance, tracing, background checks, corporate and private investigations | Individuals, legal, corporate | 5.0 |
| 2 | National Private Investigators (NPI) | London | Surveillance, bug sweeps, background checks, investigations | Corporate, legal, private | 4.8 |
| 3 | UK Private Investigator Network (UKPIN) | Nationwide | Surveillance, tracing, corporate services | Businesses, private | 4.8 |
| 4 | B25 Private Investigation | Birmingham | Surveillance, fraud, family investigations | SMEs, individuals | 4.7 |
| 5 | Intime Investigations | London | Tracing, surveillance, corporate investigations | Private, legal, corporate | 4.7 |
| 6 | Private Detective | Nationwide | Corporate investigations, background checks, personal cases | Businesses, individuals | 4.6 |
| 7 | Reveal PI | Birmingham | Corporate fraud, tracing, surveillance | Businesses, law firms | 4.6 |
| 8 | Enigma Investigations | Manchester | Surveillance, fraud, tracing | Corporate, private | 4.5 |
| 9 | NIG (National Investigation Group) | London | Insurance investigations, surveillance, fraud | Insurance, corporate | 4.5 |
| 10 | Verity Henton Investigations | Midlands | Family, matrimonial, background checks | Private, SMEs | 4.4 |
| 11 | Cambridge Detectives | Cambridge | Surveillance, tracing, corporate risk | Individuals, businesses | 4.4 |
1. Private Investigations UK
Overview:
Private Investigators UK is a nationwide agency that offers professional, private investigation services to both individuals and businesses. They keep all cases private and use advanced methods and years of experience to get clear, reliable results.
Key Services / Specialities:
Investigations into marriage and cheating
Undercover surveillance operations
Finding and following people
Investigations into businesses and fraud
Checks on the background and due diligence
Why Pick Them:
Coverage all over the UK
A team with a lot of experience handling both personal and business cases
Service that is discreet, professional, and focused on results
Ways to investigate that are legal and moral
Visit Private Investigators UK
2. UK Private Investigator Network (UKPIN)
Overview:
UKPIN has a large network of skilled investigators who work on both private and corporate cases all over the UK.
Specialities and Main Services:
Finding and following people
Surveillance of businesses
Checks for fraud and background checks
Why Choose Them:
Coverage all over the UK
A strong group of skilled detectives
People trust them for both business and personal matters.
Visit UK Private Investigator Network (UKPIN)
3. B25 Private Investigation
Overview:
B25 Private Investigation is a Birmingham-based agency that helps both private clients and businesses in a private way.
Specialities and Main Services:
Investigations into corporate fraud
Cases involving families and marriage
- Watching and following
Why Choose Them:
Well-known in the Midlands
Known for being reliable and private
Affordable choices that work for small and medium-sized businesses
Visit B25 Private Investigation
4. Intime Investigations
Overview:
Intime Investigations is a London-based investigation company that helps both individuals and businesses with tracing work, surveillance, and in-depth corporate enquiries.
Specialities and Main Services:
Checks of history and background
Finding and locating people
Help with corporate investigations
Why Choose Them:
A quiet and private way of doing things
A strong presence in London and the surrounding areas
Good at both personal and business cases
Visit Intime Investigations
5. Private Detective
Overview:
Private Detective is a national investigation company that is known for having one of the largest ranges of services in the UK.
Specialities and Main Services:
Investigations into fraud in the workplace and businesses
Watching people and tracking them down
Thorough background checks
Why Choose Them:
Good coverage all over the UK
People trust us with both personal and business cases.
A group of people with a lot of experience in the field
Visit Private Detective
6. Reveal PI
Overview:
Reveal PI is a Birmingham-based company that offers professional investigation services, with a focus on helping businesses.
Specialities and Main Services:
Finding fraud in business
Secret surveillance operations
Finding and tracking people
Why Choose Them:
Good at dealing with complicated business cases
Clear reporting and open pricing
Strong presence in the Midlands and across the country
Visit Reveal PI
7. Enigma Investigations
Overview:
Enigma Investigations is a Manchester-based company that does surveillance work and fraud cases for both people and businesses.
Specialities and Main Services:
Hidden surveillance
Investigation of fraud
Checks of the past and background
Why Choose Them:
Well-known all over the North West
Team with a lot of experience in fraud
Both private clients and businesses trust us.
Visit Enigma Investigations
8. NIG (National Investigation Group)
Overview:
NIG is a London-based private investigation firm that works on cases involving insurance fraud and business risk.
Specialities and Main Services:
Investigations related to insurance
Finding and stopping fraud
Hidden surveillance
Why Choose Them:
Has experience with fraud and insurance cases
Very well thought of in the business world
Gives clear, legally sound reports of evidence
Visit NIG
9. Verity Henton Investigations
Overview:
Verity Henton Investigations is based in the Midlands and offers private investigation services for individuals and small to medium-sized businesses.
Specialities and Main Services:
Investigations into families and marriages
Finding and tracking people
Checks of the past
Why Choose Them:
A team of investigators led by women
A unique approach for each client
Good coverage all over the Midlands
Visit Verity Henton Investigations
10. Cambridge Detectives
Overview:
Cambridge Detectives provides professional private investigation services all over the East of England.
Specialities and Main Services:
Risk assessments for businesses
Finding and following people
Secret surveillance operations
Why Choose Them:
Concentrated on Cambridge and the rest of East Anglia
Has worked on both business and personal investigations
Local investigation team with a lot of experience
Visit Cambridge Detectives
