Royal Mail lists PO Box 4988, Swindon, SN4 4SF as “L B G Returned Mail Only”. That entry appeared in its live Postcode Finder when checked on 8 September 2026 and identifies the address as a destination for returned post. Royal Mail Postcode Finder
The initials are consistent with Lloyds Banking Group, which uses the abbreviation LBG in its own publications. This points to group-related returned mail, although Royal Mail’s entry does not spell out the group’s full name or identify a particular banking brand. Lloyds Banking Group publication
For anyone holding an unfamiliar envelope, the practical distinction is between its return address and the organisation or department named inside. Read the letter before deciding whether you need to respond.
What “returned mail only” means for your letter
An address marked for returned mail tells you where an undeliverable item should go. Its appearance on an envelope you have successfully received does not mean that your letter has already been returned, or that something is wrong with your account.
The wording also gives you a reason to check before sending a new enquiry there. Do not assume the address on the back of an envelope is the correct destination for a complaint, completed form or account-change request. Use the reply instructions in a letter you have verified, or obtain the appropriate address through the sender’s official customer-service channel. Lloyds Banking Group’s contact page directs enquiries according to the bank or financial service involved. Lloyds Banking Group: Contact us
A PO Box does not provide a customer-facing office address. Royal Mail offers both collection and onward-delivery arrangements for PO Box mail, so the postal address alone does not tell you where to visit an organisation. Royal Mail PO Box service
Does PO Box 4988 Swindon mean court action or debt?
The return address alone does not establish that you owe money or face court proceedings. Royal Mail’s entry describes a returned-mail address. Separately, the official HM Courts & Tribunals Service directory gives Swindon Combined Court’s address as The Law Courts, Islington Street, Swindon, SN1 2HG. It does not list PO Box 4988. HMCTS: Swindon Combined Court
That makes it inappropriate to identify an envelope as court correspondence simply because it carries this PO Box. Equally, if the contents actually include a court claim, take the document seriously and verify it with the court named on it. For money claims in England and Wales, GOV.UK says to respond by the date stated in the letter or email; missing that deadline can lead to a county court judgment. GOV.UK: Respond to a court claim for money
How to check whether the letter is genuine
A genuine postal listing cannot authenticate every letter displaying it. The Financial Conduct Authority warns that scammers can produce convincing materials and impersonate real financial firms. FCA: Protect yourself from scams
If the letter is addressed to you:
- Identify the claimed sender. Read the organisation’s full name, the reason for writing, any reference number and any requested action.
- Find an independent contact route. Use your bank’s established app, the number on your card or an existing statement. For another financial firm, check the contact details through the FCA’s Firm Checker.
- Ask about the specific correspondence. Confirm the letter’s date, reference and purpose, and ask which department should receive any reply.
- Keep sensitive information private. Do not disclose passwords or send financial details until you are satisfied you are dealing with the genuine organisation.
If you have already paid a suspected fraudster or disclosed personal information, contact your bank immediately using the details on your card or statement. FCA: Report a scam
If it contains a banking activation code
Postal banking codes can be legitimate. For example, Lloyds says it sends an activation code through the post when someone first registers for Internet Banking. It also describes sending a one-time password by post when a customer cannot receive a passcode by text or call. Lloyds: Passcode scams
If you receive a code unexpectedly, contact the bank’s fraud team promptly. Never give the code to someone who calls you, even if they say they need it to protect your account. Lloyds explicitly warns against sharing activation codes and one-time passwords. Lloyds guidance on protecting codes
What to do if the letter is for someone else
For an envelope addressed to your home but bearing an unknown or former resident’s name, keep it unopened. Post Office guidance says to cross out your address, write “Not known at this address”, circle the return address if there is one, and put the item back in the post. You do not need to identify the bank or department before returning it this way. Post Office: Wrong post
If the delivery address itself is different, the Post Office advises putting the item through the correct letterbox when it is nearby; otherwise, put it back in the post. Avoid posting photographs online that expose the recipient’s name, address or banking information.