Lost an NS&I number or found a transfer missing?
Take three steps now: pause pending payments, gather ID, and start a trace.
Immediate action freezes further loss and starts the recovery clock.
Process summary
This list gives the exact order to follow.
It suits someone ready to act straight away.
-
Freeze outgoing payments and save screenshots of confirmations.
-
Gather identity documents and recent bank statements.
-
Call NS&I customer service and log adviser name and time.
-
Send a tracing request with certified ID and transaction evidence.
-
If there is no substantive update within 30 working days of NS&I accepting the trace, raise a formal complaint with NS&I.
Keep the tracing reference and all evidence.
Some investigations take up to eight weeks to finish.
If NS&I's final response remains unsatisfactory, refer the matter to the Financial Ombudsman within six months of that final response.
-
If the issue comes from a bank or fintech, request a bank trace and give the trace reference to NS&I.
Step 1: freeze and gather evidence
Stop further loss immediately.
Ask the sending bank or app to pause or cancel any pending payment.
Write down the time and the name of the person you spoke to.
What to capture now
Save a full screenshot of the payment confirmation screen.
Make sure it shows payee name, sort code, account number, payment reference and timestamp.
If the app only shows partial data, also save the app transaction history.
Log the outgoing transaction in one file.
Include the bank statement, app screenshot and any email or SMS confirmation.
ID documents to prepare
Have a primary photo ID ready: passport or UK driving licence.
Also get a recent HMRC letter or a full bank statement that shows name and address.
Use one primary and one secondary document where possible.
This usually speeds identity checks during tracing.
Call NS&I to open a record and learn how to upload documents.
Note the adviser name, reference number and the call time.
How to request a trace
Ask NS&I for a tracing form or for secure upload instructions.
Send certified copies of ID and transaction proof as they ask for them.
Ask NS&I for a tracing reference number and an estimated completion date.
Keep that reference in all future messages.
What NS&I will check
NS&I checks identity under UK rules and searches internal records.
They match name, payment amount and evidence of the incoming or outgoing transaction.
The most frequent error at this point is sending weak evidence, like a cropped screenshot or only a utility bill.
If you cannot sign in online, go to nsandi.com and choose Sign in → Forgotten customer reference / Forgot password.
If the automated flow fails because you no longer control the registered email or phone, call the NS&I helpline.
Ask the adviser to open an access recovery case and to send a secure upload link.
Be ready to provide primary photo ID, a recent full bank statement and the date and amount of the last known transaction.
If two‑factor authentication is set to a lost phone, ask the adviser to remove it temporarily after identity checks.
Record the adviser name and the case reference.
If NS&I asks for certified copies, get certification at a post office or by a solicitor.
Scan and upload the certified copies to the secure link.
Follow this order: automated reset, call to open access recovery, secure upload with certified ID, and keep the case reference for follow‑up.
Step 3: chase the payer bank or fintech
If the payment came from a bank or fintech, ask the payer to request a formal bank trace.
A trace often shows where funds landed and gives a trace reference.
What to ask the payer bank to do
Request a CHAPS or BACS investigation depending on payment type.
Ask for the investigation reference and written confirmation of steps taken.
If the payer used a fintech app, download the full in‑app history that shows payee details.
A timestamped screenshot from the app counts as strong evidence.
Common fintech pitfalls
Some apps change or cut the payment reference, or save the wrong beneficiary.
Screenshots that show the intended payee prove payer intent and speed matching.
This works well in theory, but in practice many savers forget to save the screenshot straight away, which delays recovery.
Use a single zipped folder named with the transaction date. Include the bank statement PDF, screenshots, certified ID copy and the initial NS&I call log. Label files clearly to speed the search.
Transfer errors fall into a few clear causes.
These include wrong reference, name mismatch, wrong sort code/account, or wrong payment rail.
Ask the payer bank for a written investigation acknowledgement and the trace reference.
Also ask for a transaction audit trail with timestamp and destination details.
For CHAPS ask for the payment confirmation or CHAPS receipt.
For Faster Payments or BACS ask for the bank’s internal trace outcome and any audit log.
Typical speeds vary by rail: CHAPS is usually same business day, Faster Payments are often immediate, and BACS clears in three working days.
Bank traces commonly return within 3–10 working days.
For ISA transfer issues, use the formal ISA transfer process.
Do not ask customers to withdraw and re‑deposit into an ISA.
Request the transferring provider supply the formal ISA transfer confirmation and any transfer reference.
This helps NS&I or the ISA manager to match incoming funds correctly.
How tracing works and realistic timelines
Tracing starts when NS&I receives the required documents and traces the payment internally.
Expect a clear reply and next steps within the timeframe NS&I gives.
Typical timeline and milestones
On receipt, NS&I will usually acknowledge a secure upload the same day, often within 24 hours.
Bank traces from the payer bank commonly return a trace reference within 3–10 working days.
NS&I identity checks and internal search typically take 10–30 working days.
Allow up to 30 working days for a substantive update before escalating (2024).
If no match appears after that time, raise a formal complaint.
If unresolved after the formal reply, the next step is the Financial Ombudsman.
What the ombudsman will expect
The Financial Ombudsman needs a full complaint chronology and copies of evidence.
Include call notes, trace references and certified ID when you refer the case.
The Ombudsman usually accepts complaints up to six months after a firm's final response and up to six years from the event, or three years from when the customer became aware, depending on the case (2024).
Case study 1, lost reference reunited within two weeks: an elderly saver moved house and lost their NS&I customer number.
A relative sent a bond purchase to the old account reference.
The payer bank provided a CHAPS confirmation that showed beneficiary sort code, account number and payment reference.
The saver supplied a certified passport and a full bank statement with the outgoing CHAPS line.
NS&I confirmed identity, matched the CHAPS confirmation, and reissued the customer reference in 12 working days.
Case study 2, fintech destination mismatch resolved after 25 working days: a Faster Payment from a fintech app showed the wrong beneficiary name because the app cut the payment reference.
The payer exported the in‑app CSV and got a written bank trace with a timestamp.
Once NS&I had the CSV, app screenshot, full payer statement and certified ID, NS&I tracked the funds and gave return instructions or recovered them within 25 working days.
These examples show the evidence that speeds outcomes: an unaltered bank audit, a full statement line, and certified ID.
Tracing and escalation flow
1
Freeze payments, save screenshots and gather ID
2
Call NS&I, ask for a tracing reference and upload documents
3
Request bank/fintech trace and supply references to NS&I
4
If no resolution in 30 working days, submit a formal complaint
5
If still unresolved, refer to the Financial Ombudsman
The text below can be copied into an email or letter.
Replace items in [brackets] with personal details.
Postal tracing letter template
[Your name]
[Your address]
[Date]
NS&I
[NS&I postal address if required]
Dear Sir or Madam,
Re: Tracing request for NS&I customer reference / Premium Bonds
I am writing to request a formal trace.
I sent a payment of £[amount] on [date] from [bank name/app].
Enclosed: certified copy of passport, full bank statement showing the payment, screenshot of payment confirmation.
Please provide a tracing reference and the expected completion date.
I expect written confirmation of receipt.
Yours faithfully,
[Signature]
Email template for tracing
Subject: Tracing request: payment of £[amount] on [date]
Hello,
I cannot access my NS&I account / I have lost my NS&I number.
A payment of £[amount] was sent on [date] from [bank/app].
Attachments: bank statement, screenshot, certified ID copy.
Please confirm receipt and provide a tracing reference and expected timeline.
Kind regards,
[Name]
Phone script
"Hello, my name is [Name]. I have lost my NS&I number / a payment is missing.
The payment was £[amount] on [date].
Please log a tracing request and give me the reference and adviser name."
| Channel |
Typical response time |
Best for |
What to ask for |
| Phone |
Immediate logging |
Urgent cases, initial record |
Tracing reference, adviser name, call time |
| Secure upload / online |
Same day receipt, processing 5–20 days |
Submitting documents |
Confirm secure upload and request confirmation email |
| Postal (certified) |
Processing 5–10 working days |
Legal record and certified copies |
Proof of posting and a request for tracing reference |
| Bank / fintech support |
Varies; get trace ref within 3–10 working days |
Bank traces and payer evidence |
Request CHAPS/BACS trace and a written confirmation |
Errors that ruin recovery chances
A few mistakes cause long delays and may stop recovery.
Avoid these errors and the process moves faster.
Not keeping payment references
Losing the payment reference or not saving the screenshot often prevents a successful trace.
The payer must supply an exact timestamp and reference.
Sending weak ID or incomplete documents
Sending a utility bill alone or a cropped screenshot will delay identity checks.
NS&I needs high quality, dated documents that clearly show name and address.
Calling complaints teams before uploading ID wastes time.
Do this order: phone to log, secure upload of documents, then a formal complaint if unresolved.
When this method does not apply
If the customer never held an NS&I product, this tracing route will not help. For a general bank error unrelated to NS&I, the payer bank is the correct first contact. Do not send NS&I documents unless NS&I confirms account ownership.
Opinion and practical verdict
Request a trace and gather certified ID immediately, but expect verification delays.
Tracing is effective when evidence has clear dates and certified ID; it fails when evidence lacks those.
Act fast: call NS&I, get a trace reference, and ask the payer bank for a CHAPS or BACS investigation.
Allow up to 30 working days before formal escalation (2024).
Bank traces often return within 3–10 working days (2024).
The Financial Ombudsman accepts complaints within six months of a firm's final response (2024).
Use the checklist above now and visit NS&I contact page to start a trace within 24 hours.
Frequently asked questions
How long does NS&I tracing take?
Answer: Expect 10–30 working days for tracing and identity checks.
NS&I often gives an estimated completion date when it accepts the case.
Tracing can be quicker with certified ID and clear bank evidence.
If the trace takes longer, log follow‑ups and prepare a formal complaint after 30 working days.
What ID does NS&I require to reissue a number?
Answer: NS&I typically needs a primary photo ID and a secondary proof of address or HMRC letter.
Examples: passport plus a full bank statement.
Certified copies speed the process.
The Data Protection Act 2018 governs how documents are handled and NS&I will advise on secure upload.
Answer: Make a formal complaint after 30 working days with no satisfactory resolution.
Include the tracing reference and all evidence.
A formal complaint must list dates and contact names.
If the final response is unsatisfactory, the next step is the Financial Ombudsman.
What will the financial ombudsman need?
Answer: The Ombudsman needs a full chronology, copies of correspondence, certified ID and trace references.
They expect clear evidence of attempts to resolve the issue.
Keep original emails, call notes and bank trace confirmations in one file.
The Ombudsman assesses whether NS&I followed fair procedures.
Can NS&I reunite premium bonds without proof of identity?
Answer: No. NS&I will not reissue a customer reference or reunite bonds without proper identity checks.
Proof of identity is mandatory under AML rules.
Send certified documents and a bank statement showing the transaction.
Poor evidence causes delays or refusal.
How long does the financial ombudsman take?
Answer: Timings vary, but many cases take several weeks to months depending on complexity.
The Ombudsman will confirm expected times when the referral is accepted.
Keep a clear file of all documents to speed the Ombudsman review.
Include trace references and certified ID copies.
Closing recommendation and next steps
The immediate action is clear: freeze payments, save a full set of evidence and start an NS&I trace.
Use the templates above and log every contact with NS&I and the payer bank.
If there is no satisfactory outcome within 30 working days, make a formal complaint and gather the file to refer to the Financial Ombudsman.
The Consumer Rights Act 2015 and the Financial Services and Markets Act 2000 give consumer protections in these disputes.
Additional sources and guidance: refer to official NS&I guidance and GOV.UK for ISA rules and complaint routes.
For legal context, the Data Protection Act 2018 and the Consumer Rights Act 2015 are relevant.
My transfer came from Revolut
Answer: Ask the payer to request an in‑app transaction export and a bank trace immediately.
Provide screenshots showing the payee details to NS&I.
Fintech apps sometimes change or cut references.
The payer must request a trace and give the trace reference to NS&I to link the funds.
