Apostille vs. Embassy legalisation for Argentina
Two different routes exist for making a UK paper work abroad. An apostille is one stamp from a single UK body, added once, and nothing more is required after that. Embassy legalisation is a longer chain: a UK stamp first, then a second stamp from the receiving country's own embassy in London, and sometimes a further step after that. Which route applies depends entirely on the destination, not on the type of document you hold.
For Argentina the shorter route applies. An apostille for Argentina is the single stamp that an office there accepts as proof the paper is genuine, so there is no separate trip to an embassy and no second signature to collect. You send the stamped paper on once it comes back from the FCDO, and the receiving office reads the apostille itself rather than asking London to confirm anything further.
Argentina's Hague status and what it means
Argentina joined the 1961 Convention in 1988. From that point, document legalisation for Argentina stopped needing an embassy chain at all: one stamp from the country where the paper was issued is enough on its own, and that has stayed true ever since without any further change to the rule.
In practice this means a Southampton-issued record does not need to be seen by any Argentine consular office in the UK before it travels. The receiving institution in Argentina checks the apostille itself against the issuing register, so the chain of checks that embassy legalisation relies on is replaced by a single lookup.
The Southampton to Argentina route step by step
Start with the right original. Southampton Register Office, at 6a Bugle Street, holds certified copies of local birth, marriage and death records, so a fresh certified copy can be ordered from there rather than risking the one you already hold. Other document types, such as a degree certificate or a signed business paper, come from whichever UK body issued them first, and that original is what travels to the FCDO, not a scan or a photocopy.
Gather what you need for an apostille for Argentina before anything is sent: the original paper, a completed application form, and the fee in the right amount. The FCDO Legalisation Office works by post only, handling documents from every UK city the same way. There is no counter to visit in Southampton or anywhere else, so the whole journey happens through the mail, and a return envelope speeds up getting the stamped paper back to you.
Cost and timing for this route
The official fee is £45 per document by standard post, or £40 per document on the next-day service, which is limited to registered businesses. Standard turnaround runs up to 25 working days, plus the time the post takes each way, so a family document mailed today should be planned around several weeks rather than days.
An express next working day option exists for registered businesses only; it does not apply to a member of the public sending one certificate. Anyone working to a fixed date for Argentina should build the standard 25-working-day window into their planning rather than assume the faster route is open to them.
Destination-specific requirements
An apostille from United Kingdom to Argentina travels as one physical stamp attached to the original. Nothing further from a UK office is needed once it is issued, and the paper does not pass through any other UK hand before it is posted onward.
Common reasons a Southampton resident needs this route include registering a UK marriage certificate with an Argentine civil registry, supporting a residency or work application, or backing a company filing. Each use still relies on the same single stamp; what differs is which Argentine office ultimately reads the paper, and that choice sits with the reader, not with the UK side of the process.