The papers that actually need this
Jamaica runs on English, so the deciding question is what language your record was issued in. A UK document usually needs nothing at all. A record made abroad is the reason this page exists: a Spanish marriage entry, a Portuguese birth line, an Arabic death record held by a family in the West Midlands and now needed in Kingston.
English, and how much of the page is carried across
A certified translation into English in Wolverhampton reproduces the whole sheet, not the parts that look useful. Round seals are written out in words. Marginal notes, correction stamps and registration numbers all appear. A Jamaican registry may copy a reference straight into its own record, so a digit that has been guessed at rather than read causes trouble later.
The certificate of accuracy and what it proves
The route is a certified translation with certificate of accuracy. That certificate is its own signed page. It carries the translator's name, the direction of the work, the date and a plain statement that nothing was added or left out. Kept with the English text, it turns a private rendering into a certified translation for Jamaica that an office will act on.
Per-page pricing and the clock
The rate is about £25 / page of source, so a dense page costs the same as a thin one. Standard delivery sits at 2–3 business days, with 24 hours available on the express lane. The clock starts on a readable scan. A dark photograph of an embossed seal is the usual reason a job waits a day before anyone can start.
Fresh UK records, and what a Kingston desk reads
Where a UK civil record is part of the story, Wolverhampton Register Office at Civic Centre, St Peter's Square, Wolverhampton WV1 1RU issues new certified copies of births, marriages and deaths. That copy is the one to let travel, so the record in your own file stays where it is. The office issues records and does no translating of any kind.
On the island the certificate is read first, then the page count, then the names. An official English translation in Wolverhampton is normally accepted on the strength of being complete and legible. Estate files fall over when one page of a multi-page foreign record was never scanned, and the gap is spotted long before the wording is.