Apostille vs. Embassy legalisation for Slovenia
A UK document heading abroad needs one of two certifications, and which one applies depends entirely on the destination country's own membership of the Hague Convention. Embassy legalisation is the older, slower route: a consulate adds its own stamp after UK authentication, and it is reserved for countries that have not joined the Convention.
Slovenia has joined, which means document legalisation for Slovenia runs through the apostille system instead. A single certificate from the FCDO Legalisation Office is enough on its own — no Slovenian consular office in London needs to add anything further before the paper can be used at home.
Slovenia's Hague status & what it means
Slovenia has recognised the Convention since 1991. Every member country agrees to treat a properly issued apostille from any other member as sufficient proof that a signature or seal is genuine, which removes the need for a receiving country's own embassy to re-verify it.
The United Kingdom has applied the same Convention since 1965, well before Slovenia joined, though the order in which two countries signed up makes no practical difference now. What counts is that both are current members, so an apostille issued in London today is treated in Ljubljana exactly as one issued anywhere else within the Convention would be.
The London → Slovenia route step by step
Start by identifying the document type, since that decides what happens next. A degree certificate or a solicitor-witnessed power of attorney can be posted as the original, because a university or law firm can usually issue a replacement if needed. A civil record works differently: Westminster Register Office can supply a fresh certified copy of a birth, marriage or death entry, which is the safer paper to send rather than risking the one original that cannot be replaced quickly.
From there, everything runs through the FCDO Legalisation Office in Milton Keynes, the single national body handling every UK apostille by post. There is no separate desk anywhere in London for Slovenia-bound paperwork; once the signature is verified, the apostille is attached and the document is returned, with an optional next-working-day express service open only to registered businesses.
Cost & timing for this route
The standard postal fee is £45 per document. Registered businesses that need speed can use the next-working-day express service for £40 per document instead — a lower fee for a faster result, available only to that category of applicant rather than to individuals sending a single personal document.
Allow up to 25 working days for standard processing, plus the postage time each way between London and Milton Keynes. Anyone working to a deadline in Slovenia — a university enrolment date or a property completion — should send the document well ahead of that date, since the processing window does not include the post. Choosing the express service where it applies removes most of that uncertainty for a registered business.
Destination-specific requirements
An apostille is the correct and sufficient certification for documents used in Slovenia. Once it is attached, a Slovenian university, employer or civil registry accepting a UK paper is relying on that single certificate — nothing further needs to be added by any consulate before the document is presented in Slovenia.
Whether the receiving office in Slovenia additionally wants a Slovenian translation depends on that specific office and what the document is being used for, so it varies case by case rather than following one fixed rule. The same is true of notarisation before the apostille stage: it depends on the issuing body and the document type, and it should not be assumed either way. Planning around the specific receiving office's own paperwork, rather than assuming a fixed rule, is what avoids surprises beyond the apostille itself, since one destination office's practice does not always match another's.