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Best Private Investigators in London

Handpicked from 65 vetted & reviewed Private Investigator & Detective agencies in the London area, discover the top 5 elite providers among the selected group of 24 finalists.

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Nationwide Investigations Group

Nationwide Investigations Group

(7)
Corporate Intelligence, Fraud Investigations, Tracing Missing Persons
“I was unsure about using a Private Investigator do internal investigations into my stock losses, Nationwide Investigations Group not only managed to help me confirm my suspicions but they gave me a full discourse on how it was being done and what st...”
Emergency Services
100 Borough High St, London SE1 1LB
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Alpha 1 Legal Services

Alpha 1 Legal Services

(18)
Surveillance Cases
“We have used Alpha 1 Legal Services on many occasions and have never been disappointed with the quality of the work that has been provided by their staff. It is fair to say that if we need to appoint an agent in an area covered by Alpha 1 then we ...”
Emergency Services
124 City Rd, London EC1V 2NX
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Conflict International

Conflict International

(1)
“A comprehensive range of excellent services!”
In Business Since 2006
Emergency Services
180 Piccadilly, St. James's, London W1J 9HF
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Argo Investigations

Argo Investigations

(1)
“they have been of great help in recovering money from our creditors”
In Business Since 2017
Emergency Services
Licensed
60 St Martin's Ln, London WC2N 4JS
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Private Investigator

Private Investigator

(3)
Person Tracing, Corporate Intelligence, Corporate Investigations
“These guys really helped me with a person who stole money from me using eBay. I didn't have to pay any moneys upfront.”
In Business Since 2004
Emergency Services
49 Queen Victoria St, London EC4N 4SA
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Best of 2024

Qualification Criteria for best of Winners

Minimum Overall Score
97 (100)
Minimum Reputation Rank
98.7 Percentile
All of our award winners are based on identifiable facts - reviews, performance, and experience - collected by scientific means. We use this data to assess each business’s essential features, weighting them according to their importance to customers.
Read our methodology
Prominent finalists
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The Local Detectives

The Local Detectives

(28)
  • Professional
  • Job
  • Evidence
“I cannot recommend these guys enough. I was a little hesitant and somewhat embarrassed to call and ask for help but I could not be happier that I did. I spoke to Rob and he made me feel so at ease about everything, he almost felt like a friend by the...”
30+ Years Experience
Emergency Services
3rd floor, 86-90 Paul St, London EC2A 4NE
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Private Investigator UK

Private Investigator UK

(27)
Cyber Investigator, Private Investigations, Surveillance
“Having never used the services of a private investigator before i was a little unsure about what to expect. I did quite a bit of research before instructing a detective. In the end i opted for this company as I had seen them on the TV a number of ti...”
In Business Since 2013
Free Initial Consultation
1st Floor, 2 Woodberry Grove, London N12 0DR
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Tacet Global

Tacet Global

(9)
Investigation Services, Legal and Other Services, Security Services
“These guys are amazing. I used them to help me with a person who was sending non stop abusive content, and I wanted to put something together to take to the police. They also undertook a complete check on my online details, to find out what public in...”
In Business Since 2019
Transparent Fees & Pricing
Emergency Services
International House, 124 Cromwell Rd, London SW7 4ET
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Private Investigator London - Principal Investigations

Private Investigator London - Principal Investigations

(21)
  • Understanding
“Really helpful and honest Private Investigator London. I had a massive problem with online harassment and was at my wits end with it all. This agency helped me to get the evidence and proof I needed. Thank you so very much.”
Craven St, London WC2N 5NP
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Trojan Surveillance Private Investigator

Trojan Surveillance Private Investigator

(6)
Private Client Services, Background Checks, Bug Sweeping
“We use All Seeing Surveillance for our London office - being based in NYC it's so crucial to find a company available around the clock to work in our time zone but with a personal service based in the UK - we've worked with them six months now - Grea...”
Emergency Services
5th Floor, 167-169 Great Portland St, London W1W 5PF
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National Private Detective Force - Npdf

National Private Detective Force - Npdf

(2)
“Professional Investigator - very pleased with the results”
Emergency Services
Free Initial Consultation
Transparent Fees & Pricing
3, Bolt Court, Fleet St, London EC4A 3DQ
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Westminster Security

Westminster Security

(15)
Close Protection, Surveillance Services, Security Chauffeurs
“I have dealt with Westminster Security Ltd in the context of my role as their insurance broker at CJ Protect in relation to their insurance cover. John appreciated the fact he needed to source appropriate specialist cover and therefore you can tell h...”
16 Old Queen St, London SW1H 9HP
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National Private Investigators

National Private Investigators

(19)
“Good quality and value of service they provided. I have contacted multiple investigation companies and this one was not only most responsive but also best value. All information I needed was provided within 3 days of placing my order. Highly recommen...”
Emergency Services
71 75 Shelton St, London WC2H 9JQ
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Sloane Risk Group

Sloane Risk Group

(8)
  • Professional
  • Team
“We initially employed Sloane Risk Group to investigate a sensitive internal company matter which was handled with great discretion & sensitivity. The management team at Sloane Risk not only mentored us through this complex investigation but provided ...”
In Business Since 2020
Emergency Services
71-75 Shelton St, London WC2H 9JQ
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1st Call Detectives

1st Call Detectives

(4)
Risk Assessment, Covert Surveillance, Insurance Fraud
“Finally a service that provides what it offers. These guys WILL get you the results you need, they provided me more info than I asked for and did not charge me further. They believe that the service and customer satisfaction is what counts and I will...”
In Business Since 2010
Emergency Services
2 Chepstow Rd, London W2 5BH
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Private Detective London

Private Detective London

(9)
Consultancy, Out of Hours Services, Tracing Services
“I contacted Private Detective London to help me investigate a case related to my business. I spoke to one of the senior managers on the phone, explained my situation and I felt that I was in capable hands. They carried out the work professionally, ef...”
In Business Since 2014
Transparent Fees & Pricing
20 N Audley St, London W1K 6LX
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Verity Henton Private Investigations Mayfair

Verity Henton Private Investigations Mayfair

(7)
“I recommended the services to my friend who wants to remain anonymous but asked if i would post a review as follows " from the moment I rang Verity Henton I was put at ease by the calming nature and professional approach of the lady I spoke with, fro...”
In Business Since 2020
Emergency Services
23 Berkeley Square, London W1J 6HE
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Valorous Group

Valorous Group

(3)
Security System Design, Surveillance Detection, Reputation Management
“Earlier this year, we had the pleasure of working in conjunction with Valorous Group on a fast paced, high profile surveillance task. Valorous Group supplied all the equipment required (top of the range), to all operatives working on the task. Th...”
Emergency Services
4th Floor, 43 Berkeley Square, London W1J 5AP
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SPS Investigations

SPS Investigations

(3)
Private Investigations in London, Surveillance, Vehicle Tracking
“Truly a wonderful honest company that I would recommend to anyone who isn't too sure how this industry operates. Both Patrick and Shaun were easy to work with and very professional in their manner. They dealt with the situation promptly and gave me g...”
Emergency Services
First Floor Office, 3 Hornton Pl, London W8 4LZ
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PEL Consultancy Services

PEL Consultancy Services

(2)
Private Investigation Services, Overseas Marital Affair Investigation Services, International Investigation Services
“Excellent and professional service. Don't listen to these google reviews. I am really surprised to see any low ratings. PEL were incredibly professional and understanding, and I highly recommend them. They are responsive, prompt and straightforward w...”
In Business Since 2020
Emergency Services
Unit 317, Harbour Yard, London SW10 0XD
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London Private Detectives

London Private Detectives

(8)
Digital Forensics, Surveillance, Lie Detector Test
“Could not recommend the team highly enough. Thorough, professional and affordable! Thank you all!”
25+ Years Experience
Free Initial Consultation
Emergency Services
3rd Floor, 207 Regent St., London W1B 3HH
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Helios Investigations

Helios Investigations

(1)
Covert Surveillance, Matrimonial / Infidelity, Workplace Investigations
“Great company, top surveillance operatives who are able to undertake complex surveillance work in central London successfully !!!”
In Business Since 2019
Emergency Services
776-778 Barking Rd, London E13 9PJ
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ASV LAW

ASV LAW

(16)
Strategic Alliance Partnership Programme, International Arbitration, Corporate Services
“I'm writing this review to counter some of the unjustified negative reviews. This company has been involved in scams. They've done nothing wrong, but a group of scammers has been using their employees names and the company name in order to conduct in...”
In Business Since 2011
Transparent Fees & Pricing
1 Knightsbridge Grn, London SW1X 7QA
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Bravo Security

Bravo Security

(11)
  • Team
“Bravo Security is an extremely professional security organisation. I have had several dealings with the company and its senior management. They have never failed to deliver a first rate security service in my dealings with them. I would highly recomm...”
Emergency Services
Damsel House, Unit C1, First Floor, Dragonfly Pl, London SE4 2FN
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