The language Botswana reads
English is the language Botswana uses for official papers, which makes this corridor unusual. A certified translation into English is what a Botswana desk asks for, and a Liverpool birth or marriage record is already in that language on the day it is issued.
So the first thing to do is look at the paper, not at the price list. If the text on the face of it is English, the translation step drops out and you are left with a much shorter job than you expected.
When the step still applies
Plenty of files held in Liverpool were not issued here. A degree earned in Madrid, a birth record from Warsaw, a court order from Lisbon: all of these are foreign-language papers, and a Botswana office cannot read them as they stand. That is where a certified translation into English in Liverpool earns its place.
Who signs the English version
The English text is written by a qualified certified translator and comes with a certificate of accuracy. That short signed page names the translator, states their standing, and says plainly that the English matches the source. It is the signature, not the letterhead, that a clerk looks for.
No court oath is involved. Some countries route this work through a judge or a listed register, but this corridor does not. The signed statement stands on its own, and it is attached to the English text so the two cannot drift apart.
Per-page cost and turnaround
An official English translation in Liverpool runs at about £25 a page. A page means a page of the source, so a two-sided form counts twice and a one-line extract counts once. Nothing extra is charged for the signed statement, which is part of the work rather than a bolt-on.
Where Liverpool papers come from
For a record made in this city, Liverpool Register Office is the source. It issues certified copies of births, marriages and deaths from St George's Hall, St George's Place, Liverpool L1 1JJ, and a copy ordered fresh costs far less than the trouble of losing the one you own.
Where a paper did come from abroad, keep it. A scan is all the translator needs, so the record itself can sit in a drawer while the English text is written. Standard work takes 2–3 business days, and 24 hours when the express lane is used.