Two papers, two spellings
People gather names over a lifetime. You marry, you settle on a shorter form, a clerk writes down what he heard. By the time a file is put together, a birth record and a current passport can carry two versions of one person. A certified translation into English in Leicester copies each name as its own paper spells it, and never edits one to match the other.
The paper that joins the two names
Where the names differ, the office reading your file needs a record saying the two belong to one person: a marriage entry, a change-of-name deed, a court order. That paper is part of the job rather than an afterthought, so a certified translation in Leicester for Nigeria often covers two records instead of one. Work the list out before you order, because a missing link sends the whole file back.
Each record gets its own signed set
Every set is finished with a certificate of accuracy, a signed sheet stating that the English matches the source. Because that sheet names the one document it belongs to, each record in your chain gets a sheet of its own. That is why a certified translation for Nigeria is counted per record: two papers means two sets, each signed, each able to stand up on its own at the far end.
Cost and speed for a file of more than one record
Pages are £25 each, so a chain of two short records costs a little more than a single one, and nothing else changes the figure. Standard work runs 2–3 business days and the express route lands in 24 hours. An official English translation in Leicester keeps to that clock whether the papers are going to a bank, a school or a court in Nigeria.