Two roads, and no discretion about which
One road finishes with a single slip that Convention countries read on sight. The other keeps going until a foreign desk has stamped it too. Which road your paper takes is decided by the destination, not by you, the sender or the office handling it. So document legalisation for Haiti is not a choice made on the day; it is the only road there is.
Where Haiti stands
Haiti has not joined the Hague Apostille Convention. An apostille issued in Derby for use in Haiti is therefore incomplete on arrival, and that is true of the neatest file as much as the untidiest one. An apostille from United Kingdom to Haiti is a first mark that a second stamp is later placed on top of, and the order never reverses.
Who applies which rule
Derby Register Office at Riverside Chambers, Full Street, Derby DE1 3AF applies rules about local entries and prints certified copies of them. The FCDO Legalisation Office, PO Box 6255, Milton Keynes MK10 1XX, applies a rule about signatures, by post and with no counter to attend. A consular desk then applies a foreign rule. Three rulebooks, three separate scopes, no overlap.
Fixed prices, movable quantities
The published British charge is £45 per document by standard post, or £40 per document next-day where the sender is a registered business. You cannot negotiate the rate, but you decide how many sheets meet it. Anyone reading up on what you need for an apostille for Haiti should treat the consular charge as a further official cost with no figure quoted here.
Where your attention actually earns something
Since nothing in the chain bends, the value of your time sits entirely at the front of the job. Naming the right record, deciding how many finished sets you will need, and starting early are the three levers that exist. Time spent looking for a shortcut is the one cost on this route with no return at all.