A mirror, not a repair
The job of the French page is to show what the English page shows. If a date of birth is out by a day, the French says the same wrong day. That feels perverse until you look at it from the other side: a desk in Côte d'Ivoire is holding two papers up against each other, and a French version that improved on the English is the one thing it cannot trust.
The language Côte d'Ivoire requires
Côte d'Ivoire asks for French, so the whole record is written out in French before it is any use there. Nothing is shortened and nothing is dropped, including a line you believe is wrong. An official French translation in Plymouth is a faithful copy in another language, and that faithfulness is exactly what gives it value at the far end.
Put the source right, not the copy
So the order of work matters more here than people expect. Read the English against a passport or an identity card, letter by letter, before you order anything. Where it is wrong, a corrected version has to come from the office that holds the entry, since a translator cannot reach into it. Only then is there any point putting the page into French.
Per-page cost and turnaround
The rate is £25 for every page of the record, and the wait is 2–4 business days from a clean copy, or 24–48 hours if you pay for the quicker option. Reading the English through costs you nothing and takes ten minutes. Translating a page you will later have to replace costs the full rate a second time, which is the whole argument for that ten minutes.