English as the destination language
Almost every page written about this subject assumes you are going out of English into something else. Sierra Leone reverses that. English is what the receiving side reads, so the translator's job is to produce it rather than to leave it behind. It changes who you are looking for: someone whose strongest writing is in English, working from a language that arrived with the document.
The language Sierra Leone requires
Documents used in Sierra Leone need to be in English, and that means the whole of the document rather than a summary of the useful parts. Marginal notes, headings and official stamps all carry meaning that a reader is entitled to see. An English version that quietly drops them leaves the receiving desk guessing about the parts it cannot read.
Certification Sierra Leone accepts
The English arrives with a certificate of accuracy, signed and dated by a professional certified translator. That statement is what separates a helpful rendering from a document another country will act on, since it names somebody who stands behind the text. Where the body receiving the file also wants notarisation, it can be added on top of the certification rather than instead of it.
Per-page cost and turnaround
The price is £25 for each page of the record, and the wait is 2–3 business days once a clear image has arrived, dropping to 24 hours by express. Neither number depends on how obscure the original language turns out to be. What you are paying for is the English at the end and the signature attached to it, and that is priced the same either way.