The short answer for South Sudan
South Sudan does not accept a UK apostille as proof on its own. It has not joined the treaty that would make member countries trust each other's stamp automatically, so the shorter route simply isn't open here — no wording on the paper, however carefully drafted, changes that starting fact.
What applies instead is legalisation: the FCDO issues its own certificate for non-member destinations, and a further, separate stage tied to South Sudan follows before the record counts as finished. Two stages, not one, is the shape of this route from the outset.
Why South Sudan sits outside the apostille system
Membership of the treaty is a choice each country makes for itself, and South Sudan, among the world's newest states, has not made that choice yet. An apostille from United Kingdom to South Sudan therefore isn't a recognised form of proof there — the gap has nothing to do with the record's contents and everything to do with which countries have signed up.
That single fact reshapes the whole route. Document legalisation for South Sudan runs through an office-to-office chain rather than a single stamp, because nothing automatically carries UK paperwork across a border when the receiving state hasn't agreed to trust it on sight.
Where the process actually starts in Liverpool
A civil record with a missing original is the most common starting snag, and it has a simple fix: Liverpool Register Office issues a fresh certified copy of a birth, marriage or death record from St George's Hall, so the one true original is never the item risked in transit.
From there, calling it an apostille issued in Liverpool for use in South Sudan overstates what actually happens — the certificate the FCDO Legalisation Office produces for this destination is a legalisation mark, not an apostille, though the office and the postal route to Milton Keynes are identical to any other UK application.
Cost and timing for the UK share of the work
There is no true apostille for South Sudan to price, but the legalisation mark that replaces it costs £45 for standard handling, or £40 per record if a registered business chooses the next-day option. Whatever South Sudan's own process costs on its end is set by a different body and doesn't appear in either figure.
Standard turnaround is up to 25 working days from the moment the FCDO has the record, plus the post either side of that window; next-day handling, open only to a registered business, cuts the office's own part of the wait to a single working day. The second, South Sudan-facing stage runs on a timeline the UK office cannot set or promise, so building in extra slack ahead of any fixed deadline is worth doing before the paperwork ever leaves Liverpool.
Who typically needs this route
Family paperwork is common here — a birth or marriage certificate supporting a family reunification case, or a death certificate settling an estate matter. Aid and development organisations also send staffing and qualification records through the identical sequence when placing personnel connected to work in South Sudan.
Whatever the purpose, what you need for an apostille for South Sudan is really the same two things every time: a certified UK record carrying the FCDO's legalisation mark, and the further South Sudan-facing stage that only follows once that mark is in place. Neither stage can be skipped or reordered, and neither one substitutes for the other, however urgent the underlying reason for sending the paperwork happens to be.
Property and inheritance matters add a third common use, particularly where a UK-issued death certificate or grant of probate needs to be relied on by relatives or a court in South Sudan. The paperwork itself looks no different from any other civil record passing through this route, and it follows exactly the same two stages as the rest.