Private investigators can sometimes support family proceedings by gathering lawful, objective evidence about specific disputed facts, but they do not decide who a child should live with, they do not replace Cafcass or the court, and they should not turn a child into the subject of unnecessary surveillance. In England and Wales, “child custody” is an everyday phrase; the modern legal framework generally concerns Child Arrangements Orders and other Children Act 1989 orders.
At Trojan Investigations, we believe any instruction involving children must begin with a clear safeguarding question and a proportionate evidential purpose. The child's welfare comes before a parent's desire to prove a point about the other adult.
Published: 23rd August 2024 | Updated: 4th September 2026
What Can a Private Investigator Do in a Child Arrangements Case?
Where there is a legitimate and clearly defined concern, an investigator may be able to gather factual material about adult behaviour or circumstances relevant to the dispute. Depending on the case and legal advice, this can include:
- lawful observation in appropriate public settings;
- documenting whether a disputed routine or handover pattern actually occurs;
- open-source and background enquiries using lawful sources;
- locating or identifying potential witnesses;
- preserving relevant public material before it disappears;
- preparing a clear chronology and factual report; and
- working to a solicitor-defined evidential question where proceedings are underway.
An investigator should not coach a child, determine parental fitness, trespass, hack accounts, plant listening devices or manufacture confrontation to create evidence.
“Custody” and “Child Arrangements” Are Not the Same Term
In England and Wales, private-law disputes about where a child lives and who they spend time with are generally dealt with through Child Arrangements Orders under the Children Act 1989. Related applications can include Prohibited Steps Orders and Specific Issue Orders.
The phrase “child custody” remains common in everyday searches and conversations, which is why it appears in this article title, but clients should understand the terminology their solicitor and the family court will actually use.
The Child's Welfare Is the Court's Paramount Consideration
Section 1 of the Children Act 1989 places the child's welfare at the centre of decisions about upbringing. Cafcass summarises the statutory welfare checklist as including the child's wishes and feelings considered in light of age and understanding, physical and emotional needs, likely effect of change, relevant background, harm suffered or risk of harm, the capability of relevant adults to meet the child's needs and the range of powers available to the court.
This matters to private investigators because evidence should be connected to a genuine welfare or factual issue. Material gathered simply to embarrass the other parent may have little relevance and can increase conflict around the child.
When an Investigator May Add Genuine Value
The strongest instructions concern a disputed fact that can realistically be tested. Examples might include an allegation that an adult repeatedly fails to attend agreed handovers, that a prohibited person is regularly present, or that statements about a routine are inconsistent with observable facts.
Before any work begins, the client should ideally discuss relevance with their solicitor. Our legal and litigation services can then be scoped around the question the legal team actually needs answered.
| Client concern | Poor instruction | Better factual question |
|---|---|---|
| Repeated missed handovers | “Follow my ex everywhere.” | “On the agreed dates, does the adult attend the specified handover location and at what time?” |
| Concern about a prohibited person | “Prove they are lying about everything.” | “Is the named adult repeatedly observed at the relevant address or handover location during the defined period?” |
| Substance misuse allegation | “Get evidence they drink.” | “What specific observable behaviour is relevant to the stated welfare concern, and can it be recorded without speculation?” |
| Unclear living arrangements | “Watch the child around the clock.” | “Can an adult's claimed residence or routine be tested through proportionate adult-focused enquiries?” |
| Online concern | “Get into their private messages.” | “Is there relevant public material that can be preserved lawfully and verified?” |
Private Investigators Do Not Replace Cafcass
Cafcass has a statutory role in private-law proceedings and provides the court with safeguarding information and, where directed, further assessment or reporting. A private investigator instructed by one party is not independent in the same institutional sense and should never present themselves as making the court's welfare assessment.
Our job is narrower: gather and report facts accurately, explain limitations and avoid overstating what an observation proves.
Surveillance Must Be Necessary and Proportionate
Surveillance can sometimes produce useful factual evidence, but family cases demand caution. Repeated observation of a child, school, home or private family activity may create significant privacy and safeguarding concerns. The objective should therefore focus on the adult conduct in dispute and use the least intrusive method capable of answering the question.
Where surveillance is justified, our personal investigation services are planned around a defined objective rather than open-ended monitoring.
Children's personal information requires particular protection
The ICO states that children merit specific protection under the UK GDPR because they may be less aware than adults of the risks, consequences and safeguards associated with use of their information. Where legitimate interests are relied upon, the controller must identify the interest, show the processing is necessary and balance it against the child's rights and freedoms.
This is one reason an investigator should collect no more child-related information than the legitimate purpose genuinely requires.
Domestic Abuse and Risk of Harm Change the Case
Where a client reports violence, stalking, coercive control, threats, abduction risk or immediate danger, a commercial investigation may not be the first or only response. Family proceedings have specific safeguarding procedures and the court must consider harm where relevant.
Police, safeguarding services, emergency legal remedies and specialist domestic-abuse support can take priority. An investigator should never encourage a client to create a confrontation in order to obtain footage.
What Counts as Useful Evidence?
Useful evidence is specific, dated and connected to an issue the court or solicitor needs to determine. A report should distinguish direct observation from information supplied by the client and from the investigator's interpretation.
A defensible investigation record should include
- the instruction and exact factual question;
- date, time and location of relevant observations;
- who made the observation;
- what was actually seen or heard, without assuming motive;
- original photographs or video where lawfully obtained and relevant;
- clear disclosure of gaps in continuity;
- the source and date of any open-source material;
- steps taken to preserve original files;
- limitations and alternative explanations; and
- no unsupported conclusion that one parent is “fit” or “unfit”.
Why Social Media Evidence Needs Verification
A public post may be relevant, but screenshots can lack context, accounts can be impersonated and old content can be reposted. A professional report should record the source, date, account identifier and context and avoid turning a single online image into a broad conclusion about parenting.
Private messages and restricted accounts should not be accessed through guessed passwords, borrowed credentials or impersonation.
Background Enquiries Need a Clear Relevance Test
A parent's new partner, household member or associate may become relevant where there is a specific safeguarding issue, but curiosity is not enough. The investigation should identify what fact is being tested and why it matters to the proceedings.
Criminal-record information is tightly controlled. A private investigator cannot simply obtain any protected criminal record because a client is involved in a family dispute.
Do Private Investigators Interview Children?
Ordinarily, a private investigator instructed by one parent should be extremely cautious about directly interviewing a child. Children's wishes and feelings in proceedings are dealt with through established legal and safeguarding processes. An unstructured investigator interview can distress the child, create allegations of coaching and damage evidential reliability.
If a child spontaneously provides information relevant to immediate safety, safeguarding obligations take priority over trying to develop the account as an investigator.
Do not turn the child into the investigation
- Do not ask the child to spy on the other parent.
- Do not place tracking or recording equipment on a child to obtain evidence.
- Do not encourage the child to provoke conversations.
- Do not question the child repeatedly about what happens in the other home.
- Do not share adult allegations with the child to influence what they say.
Handover and Contact Disputes
Handover disputes often generate allegations that can be tested more cleanly than broader parenting accusations. If the issue is whether someone repeatedly attends, arrives late, brings a prohibited person or breaches a defined arrangement, a short observation around specific dates may be more proportionate than following a family for entire days.
The report should record what happened, not infer why it happened.
How Investigation Fits Alongside a Solicitor
1. The legal issue is identified
The solicitor explains which disputed fact may affect the proceedings and whether evidence from an investigator could assist.
2. We narrow the factual question
Instead of “prove they are a bad parent”, the instruction becomes a time-limited question capable of objective observation or research.
3. Safeguarding and proportionality are reviewed
We consider the child, location, privacy impact, any domestic-abuse allegations, existing orders and whether a less intrusive method can answer the question.
4. Evidence is gathered and preserved
Original material, notes and timings are maintained with a clear record of what was and was not observed.
5. The solicitor decides how it is used
The investigator provides facts. The legal team decides whether and how that material should be deployed in proceedings.
What a Private Investigator Cannot Decide
We do not decide residence, contact, parental responsibility or what order the court should make. We do not diagnose substance dependence, mental-health conditions or the emotional impact on a child unless appropriately qualified evidence exists from the relevant professional.
A factual observation can be important, but it is one part of a wider welfare assessment.
Family Proceedings Are Already a Significant and Time-Consuming Process
Ministry of Justice statistics show that 15,534 private-law cases started in England and Wales between January and March 2026. There were 29,793 new private-law orders applied for, involving 22,928 individual children. The mean time to disposal was 35 weeks, down around five weeks from the same period in 2025. Those figures underline why clients benefit from focused evidence rather than generating large volumes of material with little relevance.
What Parents Should Prepare Before Instructing an Investigator
A useful instruction starts with documents and a timeline rather than allegations alone. Where available, provide the relevant order or written arrangement, dates of the disputed incidents, names needed to identify the adults involved, any solicitor correspondence that defines the issue and existing material that shows why the concern is more than suspicion.
This allows the investigation to be narrower, reduces unnecessary intrusion and makes the final report easier for a solicitor to assess.
A Child-Focused Investigation Should Be Narrow, Lawful and Useful
The right private-investigation instruction can help clarify a disputed fact. The wrong one can increase conflict, intrude on a child and create material that does not assist the court. Our approach is therefore to ask what fact matters, whether it can be tested lawfully and whether gathering it is proportionate to the child's welfare and the client's legal objective.
If you need to discuss a family or child-arrangements concern, you can also review our relationship investigation services or book a confidential consultation with Trojan Investigations. Where proceedings are active, we encourage coordination with your solicitor before intrusive work is commissioned.
Relevance Is More Important Than Volume
Family disputes can generate large collections of messages, photographs, social-media posts and allegations. An investigator's role is not to turn all of that material into a bigger bundle. The first question is whether the evidence helps answer an issue that matters to the child's welfare or to compliance with an existing arrangement or order.
A short, well-documented observation of a disputed handover can be more useful than days of general surveillance. Similarly, a verified public post directly relevant to a specific allegation may carry more value than hundreds of screenshots about unrelated adult behaviour.
Examples of Evidence That May Be Relevant — and Evidence That Usually Is Not
| Material | Potential relevance | Important limitation |
|---|---|---|
| Repeated missed agreed handovers | May help establish a factual pattern around contact arrangements | Does not explain the reason for each absence without further evidence |
| Presence of a named prohibited person | May be relevant if connected to an order or specific safeguarding concern | Identity and frequency must be established accurately |
| Public social-media content | May corroborate a location, event or public statement | Must be verified and placed in date and context |
| General evidence that a parent socialises | Usually weak unless linked to a defined welfare issue | Ordinary adult behaviour should not be presented as parental unfitness |
| Rumour from a mutual contact | May identify a question to test | Rumour is not proof and should be attributed as hearsay information |
Existing Court Orders Must Be Read Before Operational Work
If there is already a Child Arrangements Order, Prohibited Steps Order, Specific Issue Order, non-molestation order or other relevant direction, the investigator needs to know about it before planning work. The wording may define the factual issue and may also affect where and how adults interact.
Clients should provide the current document rather than summarising it from memory. A small difference in wording can change whether an observed event is relevant to the legal question.
Why Investigators Should Avoid Parenting Judgements
Investigators observe events; they are not automatically qualified to assess parenting capacity, diagnose neglect, determine the psychological effect of behaviour on a child or decide what arrangement is in the child's best interests. Those are broader professional and judicial questions.
A strong report therefore uses descriptive language. It records that an adult arrived at a stated time, that a named person was present, that a vehicle left a location or that a public post appeared on a particular account. It should avoid labels such as “unsafe parent” unless the phrase is clearly attributed to another source and relevant to the instruction.
What Happens If the Investigation Reveals a Safeguarding Concern?
If evidence suggests immediate danger or serious harm, the priority changes. The client should not wait for the investigation to produce a polished report before seeking emergency help. Police, children's social care, emergency legal advice or another appropriate safeguarding route may be necessary.
Where the concern is serious but not immediate, we can preserve what has been lawfully obtained and coordinate with the client's solicitor about the correct next step. The investigation should never be allowed to delay protection of the child.
How to Keep the Child Out of Adult Conflict
Practical boundaries for clients
- do not tell the child what the investigator is trying to prove;
- do not ask the child to report on the other household;
- do not share surveillance images with the child;
- do not use the child to create opportunities for evidence gathering;
- do not post allegations or investigation updates publicly; and
- keep communication with the investigator and solicitor on adult channels.
Sources and References
- Children Act 1989 — section 1 welfare principle and welfare checklist.
- Cafcass — Our role in private law proceedings, including the section 1 Children Act 1989 welfare checklist.
- Cafcass — information about private-law proceedings and child arrangements.
- Ministry of Justice — Family Court Statistics Quarterly: January to March 2026, published 25 June 2026.
- HM Courts & Tribunals Service — guidance on Child Arrangements, Prohibited Steps and Specific Issue Orders.
- Information Commissioner's Office — Children and the UK GDPR, updated 15 May 2026.
- Information Commissioner's Office — legitimate interests and children's personal information.
- Practice Direction 12J — Child Arrangements and Contact Orders: Domestic Abuse and Harm.