Cheating Partner Investigations: How to Catch a Cheating Partner | Sentry Private Investigators Ltd
- Sentry Private Investigators

- Sep 9, 2024
- 8 min read
Updated: Mar 26

Infidelity Private Investigations
Private investigators have forever been known for helping clients by proving infidelity within their relationships. The emotional journey of considering cheating partner investigations can be challenging, as clients face uncertainty and difficult emotions throughout the process. Infidelity Investigations can be a very seedy business as we have seen on plenty of our jobs, but without us there is no way clients would ever know what their partner has been getting up to. Infidelity investigations always have an emotional element attached to them, and the results can have a significant emotional impact, whether suspicions are confirmed or dispelled. Many clients experience heightened anxiety during the period between deciding to investigate and receiving results.
For those facing divorce or custody issues, solid evidence is crucial, as it can significantly affect legal outcomes. Our professional investigators are equipped to support clients through this challenging process, ensuring discretion and expertise every step of the way.
What to Look Out For to Gather Concrete Evidence
There are plenty of signs to look out for if you suspect your partner is cheating on you or having an affair. Recognising the main signs of infidelity early is crucial, as these indicators can help you determine whether further investigation is needed. We have put a short list together below, but the clearest sign of all comes from gut instinct. If you have strong suspicions that something isn’t right, then you are probably right. The problem is proving it. You can ask the question or even do some of your own investigating yourself, but when someone is hiding an affair they are not going to openly admit it and they are going to be very careful in covering their tracks.
Phone behaviour - Today, everyones secrets are in their phones. Whether its call logs, text messages, Whatsapp messages, emails, location data, hidden folders, images, videos, social media, the list goes on. However, all of this can be deleted and a cover story can often repute an allegation. Just keep an eye on your partners behaviour with the phone. Are calls being taken in another room or outside? Is the screen being shielded when messages are going back and forth? Is the phone often placed screen down or often switched off? Secretive behaviour regarding their phone or online activity is a main sign of infidelity, and frequent password changes or sudden secrecy about devices can be a red flag.
Absence - Absence is a tricky one as there will always be a cover story. However, cover stories need to be backed up with an alibi. If you suspect your partner is out and getting up to no good, send some messages or make some phone calls to check the alibi. Unexplained absences or changes in routine, such as a sudden change in your partner's work hours, are key signs that may indicate infidelity.
Money - It can cost a lot of money to have an affair. Keep an eye on the finances and account for every penny going out. If you are seeing payments for things like meals, drinks, hotels or activities that you were not involved with, something isn’t right. However, a clever cheat will use an account you don’t have access to making things very difficult to monitor. Unexplained financial expenses that do not align with usual spending habits may also indicate infidelity.
Appearance - Who is he (or she) dressing up for? Why the sudden change of appearance? Who is he (or she) trying to impress? It could be nothing, just making some changes, or even trying to impress you! But its worth taking note of it. If your partner is suddenly more concerned about their appearance, it may be a sign of cheating.
Unusual behaviour or a partner acting strange—such as being more defensive, emotionally distant, or suddenly changing routines, can be main signs of infidelity, but may also compromise an investigation if your partner becomes suspicious.
Monitoring your partner's activities and behaviour, including observing the subject's behaviour and daily routines, is essential for gathering evidence. The way your partner behaves can influence the length and scope of a cheating partner investigation.
Social media monitoring and background checks are discreet ways to gather preliminary information and insights into your partner's or a third party's activities, helping to confirm suspicions and provide a comprehensive view of the situation.
What To Do About It

Now you are seeing all the signs of a cheating partner and you’ve got the gut wrenching feeling. So what now? You have been married for 10 years, you have a mortgage and other bills to pay for each month and two children to support. If you prove your partner is cheating on you, it's likely going to end the relationship which is going to turn everyone's life upside down, hence the emotional aspect we mentioned earlier. In these situations, it is crucial to gather evidence and seek irrefutable evidence or concrete proof before making any legal or personal decisions. So, you can either let it continue (which really is not a good idea) or get the evidence needed to prove your allegations.
You can by all means do this investigation yourself, but we don’t recommend it. Infidelity investigations require covert surveillance to prove your partner is a cheat. This makes things somewhat difficult when your partner knows what you look like and what you drive etc. Whilst your partner is out cheating, your face will be the one face he or she is looking out for. Imagine a spinning airport radar, that's what your partner's head will be doing. We recommend hiring a private investigator to do the work for you. Professional investigators are experienced in handling matrimonial investigations with discretion and sensitivity, ensuring your case is managed confidentially and effectively.
Private investigators use a combination of GPS tracking and covert surveillance to investigate suspected infidelity. GPS vehicle tracking can provide a broad overview of a partner's movements, even when specific details are lacking. Covert surveillance is a powerful tool when there is specific information about when infidelity is likely to occur. Surveillance operatives document movements, observe body language, and record interactions to provide a comprehensive picture of a partner's behaviour. Covert surveillance can also include the use of high-tech equipment such as night vision cameras and long-range lenses to gather detailed photographic evidence and video evidence. Even if you do not know the identity of the other party involved, private investigators can monitor your partner's activities and gather evidence.
Digital forensics is another key part of the investigation process. Investigators can uncover deleted messages and browsing history from electronic devices, which can provide crucial evidence of infidelity. Social media monitoring and background checks are also used to track online interactions and verify information. All evidence gathered through professional private investigation services is generally admissible in UK courts, provided it is obtained legally and ethically.
The cost of a cheating partner investigation depends on the complexity and duration of the case. For example, GPS tracking costs £349 per week. The minimum cost for covert surveillance is £590, which includes five hours of monitoring, and the hourly rate is £59 per hour per operative. The cost of surveillance can increase if additional hours are required beyond the initial minimum engagement. Private investigators typically provide clear and upfront pricing with no hidden fees, and infidelity investigations usually require a minimum engagement period to gather meaningful evidence.
At Sentry Private Investigators Ltd, we offer a confidential consultation and a free consultation for new clients to discuss your concerns and outline the best approach for your situation. Discretion and confidentiality are paramount in handling matrimonial investigations, and we provide detailed reports with photographic and video evidence to support your case. Choosing a private investigator with proper licensing, insurance, and a proven track record is essential for successful outcomes. Emotional support is also important during and after the investigation, and we can guide you through the process of rebuilding trust if you choose to continue the relationship.
In addition to matrimonial investigations, Sentry also offers corporate investigations for business clients, providing professional and discreet services tailored to your needs.
Having time, space and knowledge is the best position to be in when given evidence of a cheating partner. It allows you to gather your thoughts and make a plan. Whether that plan is to head straight to the restaurant and dump his bolognaise on his head in front of his bit on the side, dump his clothes out the window and change the locks or play it cool and tell his mum and dad first… We have seen many approaches from clients but the point is, you have considered the best approach for your situation.

Get It Done by Professional Investigators
Over the years Sentry Private Investigators have seen it all. Cheating partners go to great lengths to hide acts of infidelity and even greater lengths when visiting brothels… There is a reason why private investigators are hired to evidence these acts, because we know what we are doing and it's a better option than doing it yourself. If you suspect your partner is being unfaithful then get it done professionally. We often prove something clients have known to have been going on for years. We just get the evidence for clients to finally put an end to things.
Many clients have benefited from our discreet and effective cheating partner investigations. Reach out today for a confidential, free consultation tailored to your situation.
Call: 01217691626
Understanding the Law
When you suspect a cheating partner, it’s natural to want answers quickly, but it’s just as important to ensure that any investigation is conducted within the boundaries of the law. In the UK, private investigators are required to operate under strict legal guidelines to protect both your interests and the privacy rights of all parties involved. This means that all evidence gathered during a private investigation must be obtained legally and in a manner that is fully compliant with UK privacy laws.
Specialist matrimonial investigators, like those at Sentry Private Investigators, are trained to use investigative methods such as covert surveillance, vehicle tracking, and digital forensics in a way that is both effective and legally permissible. Whether you need to monitor your partner’s activities, track their vehicle, or examine digital footprints, our private investigation services are designed to gather concrete evidence without crossing legal boundaries. Every step of the investigation process is carefully planned to ensure that all the evidence collected can be used in legal proceedings, should you decide to take further action.
It’s also important to understand that the cost of an infidelity investigation can vary depending on the complexity of your case and the specific services required. At Sentry Private Investigators, we believe in clear communication and transparency, providing a detailed breakdown of infidelity investigation costs during your initial consultation. This way, you know exactly what to expect and can make informed decisions about how to proceed.
If your suspicions are confirmed and you need to use the evidence in divorce proceedings or other legal action, you can rest assured that our trained investigators will provide detailed reports, photographic and video evidence, and all relevant information obtained legally. Our goal is to give you peace of mind and the necessary evidence to make the best choices for your relationship and your future.
By working with a reputable private investigator who understands the law, you can be confident that your investigation will be handled professionally, discreetly, and within all legal boundaries. Whether you’re dealing with a suspected cheating partner or need support with other partner investigations, Sentry Private Investigators is here to help you uncover the truth and move forward with confidence.
