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We boast over 20 years of experience in intelligence gathering for clients all over the world.



Private Detectives London

Capital Investigations

Private Investigations UK guarantees service in London, the south of England, and the rest of the United Kingdom. We’ve been gathering intelligence for businesses and private clients for over 15 years, and we pride ourselves on our customer satisfaction.

Whether you suspect an employee of theft, you need evidence for a child custody case, or you need to find an address, Private Investigator London can help you.

We offer everyone a free, 30-minute consultation over the phone. If you’re interested in hiring a Private Detective in London, give us a call on 020 7112 9309.

If you need services Up North, check out our offices in Preston, Birmingham, and Glasgow.

Read More: how to choose a right PI in London?



John provided my company a brilliant service. Surveillance was needed to check if an employee was really off sick or not. We were provided with a very professional and fast service, and a very clear, detailed report. This helped the company to obtain all the evidence that we needed. I Will definitely be using John again. Thank you.


The service i received was brilliant. Very professional and discreet. I had a feeling that my partner was cheating on me and unfortunately it turned out i was right. John was very sympathetic and was very helpful with all his good advise. He helped me get through a very tough experience. I will always be very grateful. Thank you John.


I can well recommend these services John was very committed and finally got my results. Whenever you need advice or someone to listen this man is dedicated and advises the way to go. Thank you John. I.can well recommend this company.




Accessible Office

Our York Street office is easily accessible by rail, underground, and bus. Just a five-minute walk from Marylebone Station, hundreds of London buses serve the street every day. If you’d like to chat with one of our private investigators in Marylebone, please call 020 7112 9309 to arrange an appointment.


We love meeting our clients, but for security reasons, we politely ask that you don’t visit our office without letting us know first. We’d hate to send you away, so please give us a call before you come to see us.

London Investigative Services


Most of our clients have never used a private detective before, and we understand that it can be hard to divulge details about your personal life to a stranger. We’re here to make sure you feel as supported as possible, from your initial consultation to your final feedback. We have a professional but personable approach to our investigations to ensure our clients feel at ease.


If you’re interested in respectful, client-focused investigations, we’d love to tell you more. Give us a call for a friendly chat and free advice.


Services for Businesses

London is internationally renowned as a city of commercial giants and the epicentre of global finance. London’s worldwide relevance shows no sign of relenting. Now more than ever, businesses in London need help to keep themselves protected from rogue employees and malicious competitors. Private Investigations UK offers investigative solutions to companies across London and The South.

Fraud and embezzlement threaten to bankrupt even the largest companies. Our fraud investigators can trace withheld assets and provide concrete proof of employee misconduct. We can also conduct thorough ID checks to prevent fraud as early as possible.

Before you welcome someone to your team, you should find out as much as you can. We call this enhanced due diligence. We offer EDD background checks to help you with the hiring process and as investment pre-screening. Get in touch with us to find out more about our different background checking packages.

Has your employer wrongly accused you of theft? Do you think your employee could be stealing from your business? We now offer lie detector tests to assist with internal investigations. Whatever your workplace dispute, we can conduct private polygraph tests to determine whether someone is telling the truth with a high degree of accuracy.

We can conduct the test here in our York Street office, in your office, or the privacy of your home. Find out more about polygraph tests.


Uncovering Cheating

Our most popular services include our infidelity investigations. If you’re looking to catch your cheating husband or wife in the act, we can conduct covert surveillance to find out the truth. We always recommend that prospective clients check out our Signs of a Cheating Partner before beginning an infidelity investigation.

If you’ve spotted one or more common signs, we can likely get evidence of cheating. We understand this can be a difficult time, so we guarantee patient, professional, and empathetic service. Of course, we love empowering our clients with facts, but we also know how important it is that you feel supported every step of the way.

At PI UK, we believe that there’s a suitable investigation for everyone. We offer cost-effective solutions tailored to your budget, whatever your problem may be. To discuss your goals and the services we can provide, please give us a call for a friendly chat and a free consultation.

Safety is Our Priority

Responsible London Private Detective Agency

We love working in London. From Kensington to Bermondsey, we guarantee service across The Capital. From our feedback, we understand that many other London agencies don’t always take the time to listen to the client properly. We think that can seriously hamper your chances of success. After all, how can we ensure that we can get you the evidence you need if we don’t fully understand your goals?


We think the most critical part of a successful investigation is getting to know our clients. That’s why we offer everyone a free, no-obligation consultation of up to 30 minutes. We make ourselves available 24 hours a day, so we’re always available to chat, give you updates, and offer a shoulder to cry on if you need it.


PI UK values professional, respectful, and ethical investigations. We carefully vet all of our agents to ensure they’re of the highest standard. We don’t compromise on confidentiality, so we’ll never reveal details of your investigation to anyone unless you ask us to.


Is your husband or wife behaving strangely? PI UK can help.

We’ve spent the past 20 years perfecting our surveillance techniques. Find out how surveillance can help you.

We believe a successful marriage begins with an investigation. Make sure you know who you’re welcoming into your family.

PI UK’s relationship expert has put together a list of red flags to look out for in your relationship.

Divorces are always unpleasant, especially if things get messy. PI UK can help.

Our infidelity investigator answers every question you could have about looking into unfaithful partners.

Nobody wants to fight for the right to care for their child. Find out about how our services can help.

We’ve perfected our number tracing strategy. Find out who’s calling you with help from PI UK.

Hidden assets can be damaging for hundreds of different reasons. Read about PI UK’s asset searching services.

If you need to find out where someone lives, PI UK’s Address Finder can help. 

We specialise in uncovering the past. PI UK offers private background checks for businesses and individuals.

Due Diligence helps you to ensure that your company is safe when you make major decisions.

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