The document you hold is not part of the product
Many people arrive expecting to hand over a certificate and get it back improved: stamped in a corner, endorsed on the reverse, or bound to something more official-looking. A certified translation for Nigeria does none of that. It makes fresh pages and leaves your own paper precisely as it was before.
The distinction matters more than it first sounds. Once you know that nothing is being applied to your document, you also know that losing it would be a plain loss rather than an interrupted step, and that keeping it safely at home costs the job nothing whatever.
English is the language the file is read in
Documents used in Nigeria have to be readable in English, so a certified translation into English in Sunderland is what any item in another language calls for. The foreign sheet keeps its own wording throughout, and the English version sits beside it as a separate document with its own pages and its own statement.
That pairing is deliberate. A reader is meant to hold the two together and see that the second answers to the first, which only works while the first is still in the state it was issued in. Marking it would blur the very comparison the pair exists to make possible.
What the certificate is attached to
The certification is a certificate of accuracy, signed by a certified translator and fastened to the English pages. Read closely, it is a statement about the translator's own work: these pages correspond to the document that was read. It makes no claim about your paper and adds nothing to it.
This is also why a certified translation in Sunderland for Nigeria cannot be moved onto a different source sheet afterwards. The signature is given for one identified document, so a second document means a second set of pages carrying a second statement of its own.
Per-page cost and turnaround
Work is priced at about £25 per page, taking 2–3 business days as standard or 24 hours by express. The count runs over the sheets that carry text in the pages produced, so the price follows the translating rather than the size of the pile you keep at home.
An official English translation in Sunderland is best begun from a copy that would not be missed. For a birth, marriage or death entry, Sunderland Registration Service prints fresh certified copies at City Hall on Plater Way, which keeps the household's own record out of circulation altogether.