To trace a person accurately, start with a full name and at least one corroborating identifier. The quality of the starting information affects speed, accuracy and whether a result can be responsibly verified.
If you need to trace a person in the UK, a full name is the starting point, not the complete instruction. A date of birth, previous address, telephone number, email address or known employer can distinguish the correct person from someone with the same or a similar name. You should also explain why the trace is required and how the result will be used.
The strongest instruction combines three things: a clear identity, a legitimate purpose and enough recent information to verify that any address found belongs to the right person. More information can help, but only when it is relevant and reliable.
The minimum information needed to trace a person
A full legal name is normally the minimum useful detail. If the name is common, shortened or may have changed, it is unlikely to be sufficient on its own. Include at least one corroborating identifier wherever possible:
- full date of birth or an approximate age;
- a last known residential address and the period when the person lived there;
- previous names, aliases or alternative spellings;
- a current or historic telephone number;
- an email address;
- a known employer, occupation or company association;
- the names of close relatives or known associates, where relevant;
- a court, claim, invoice or estate reference connected to the reason for the search.
You do not need every item on this list. One strong identifier can be more valuable than several uncertain details. A full name with an accurate date of birth is usually a better starting point than a name, an unverified social profile and an approximate location.
Why accurate starting information matters
A professional trace is not simply a search for a name in a database. The important question is whether the information identifies the correct person and whether the result is current.
Common names create obvious risks. Previous addresses may belong to former partners or relatives. Telephone numbers can be reassigned, and social profiles can be outdated, copied or deliberately misleading. If an investigator reports the first plausible match without corroboration, the result may direct legal correspondence to the wrong household or disclose personal information about an unrelated person.
Before you instruct a trace, separate what you know from what you suspect. Record where each detail came from and when it was last confirmed. This gives the investigator a cleaner starting point and makes the final verification more defensible.
Give the reason for the trace, not just the name
The reason matters because tracing involves personal information. A professional investigator should ask what you need to achieve, whether the proposed search is proportionate and whether there is a lawful basis for handling the information.
The Information Commissioner’s Office explains that legitimate interests is not automatic permission to process personal information. The purpose, necessity and effect on the person’s rights must all be considered. You can read the ICO guidance on legitimate interests for the current three-part test.
Legitimate instructions can include locating a debtor, finding a witness, administering an estate, serving legal documents, verifying an address for an existing claim or attempting to reconnect with a family member. Curiosity, harassment, intimidation or an attempt to evade a person’s privacy rights is not a proper basis for a trace.
What to provide for different types of trace
Finding a current address
If you know the person’s identity but need a current address, provide their full name, date of birth if known, every previous address you can confirm and the approximate date of your last contact. The address tracing service is the appropriate route when the name is known and the address is missing or out of date.
Tracing from a telephone number
A visible UK mobile or landline number can provide a useful lead, but it is not proof of identity or residence. Ofcom warns that caller identification can be spoofed, which means the number displayed on a phone may not belong to the caller. Its calling line identification guidance explains why accurate caller data matters and how spoofing can mislead recipients.
If the telephone number is the only reliable detail you hold, include the complete number, dates and times of relevant contact, whether communication was by call, text or messaging service, and any name or business used by the caller. The phone number to address service can then assess whether the number is a realistic starting point. It cannot turn a withheld, fabricated or spoofed number into a verified address.
Locating a debtor
For a debtor trace, supply the details that connect the person to the debt: their full name, last known address, date of birth if held lawfully, telephone and email details, company information, invoice or agreement, and any court reference. This helps distinguish the debtor from another person with the same name. Use the debtor tracing service when the purpose is debt recovery.
Finding a witness or serving documents
Where the trace supports litigation, include the case reference, the person’s role in the matter, the last confirmed contact details and any deadline. Locating the correct person is separate from proving that documents were served. UKPI can link a verified trace with its process serving service where both are required.
Reconnecting with someone
For a family member, former friend or another lost contact, explain the relationship, when contact ended and what consent or sensitivity issues may arise. A trace may identify a current route for contact, but the person being sought still has the right to decide whether they want to respond. In sensitive cases, an intermediary approach may be more appropriate than disclosing an address directly.
What a professional trace should establish
A useful result should do more than produce a possible address. It should establish, as far as the available evidence allows:
- Identity: the result relates to the person named in the instruction.
- Recency: the information is current enough for the purpose of the trace.
- Connection: the person is genuinely associated with the address or contact detail reported.
- Limitations: any uncertainty or conflicting information is stated rather than hidden.
The correct outcome is not always a positive match. If the available information does not support a responsible conclusion, the investigator should say so. A result that cannot be verified may cost more than no result at all.
Information you should not send
Do not obtain or provide passwords, private account access, intercepted messages, bank login details or information acquired through deception. Do not send large amounts of unrelated personal information simply because you possess it. The instruction should use the minimum information necessary for the stated purpose.
If you are unsure whether a document or identifier is relevant, describe it first. The investigator can explain whether it is needed and how it will be handled before you transmit it.
How to prepare a tracing instruction
- Write down the objective. State what question the trace must answer and what you intend to do with the result.
- List confirmed identifiers. Put verified names, dates, addresses, numbers and email details before assumptions.
- Add dates and sources. Note when each item was accurate and how you obtained it.
- Include the relevant evidence. Provide a court reference, invoice, agreement or estate document only where it supports the purpose.
- State the deadline. Explain any hearing, limitation, service or recovery date that affects timing.
- Ask what will be verified. Make sure the proposed result will answer the commercial, legal or personal question you actually have.
Can someone be traced with limited information?
Sometimes. A phone number, previous address or unusual combination of name and employer may be enough to begin. Limited information normally increases the need for corroboration and may make the trace slower or inconclusive. No responsible investigator can promise that every person can be found.
If you need to trace a person but do not know whether your information is sufficient, send the confirmed details first. UKPI can assess the instruction before deciding which tracing route is appropriate.
Start with the information you can verify
You do not need to solve the case before asking for help. You do need a clear purpose and an honest account of what is known. To start a confidential UK trace, use the person tracing form. If you want to discuss the instruction before supplying personal information, call 0800 043 1754 or use the confidential enquiry form.
Speak to an accredited investigator about your specific situation.
Call 0800 043 1754