The bundle that leaves Devon
What travels is not a translation on its own. It is the source paper or a certified copy, the target text, and the witnessed oath saying the two agree, kept together and numbered as a single item. Whoever receives it reads the oath first, because that is the sheet carrying a name, a credential and a witness. A certified translation of a Translator's Affidavit in Plymouth is put together on exactly that assumption.
Readers who will not take less
Plymouth sends a steady flow of paperwork to sea and overseas, and the offices at the far end are not uniform in what they accept. Some are content with a translator's signed certificate on headed paper. Others open nothing without a witnessed oath, among them foreign courts, residence registers and crewing departments answerable to a regulator of their own. A certified translation of a Translator's Affidavit in the United Kingdom is drawn to that stricter pattern.
The line that decides it
Every other fault can be argued about. A missing witness cannot. If no notary public or solicitor attested the signature, the paper is a translator's opinion rather than sworn evidence, and a reader who asked for an oath has nothing to weigh. Dates matter almost as much, and so does naming the covered document in full. An official translation of a Translator's Affidavit in Plymouth carries all three of those before it leaves.
Language, and the copy you keep
Language comes from the destination rather than from here, and it is not always English even where English is read fluently, so ask the receiving office in writing before the translator opens the file. The second point is easier to settle. Plymouth Register Office charges a fee for a further certified copy of a civil entry. Use that as the source and a sworn translation of a Translator's Affidavit in Plymouth leaves the certificate in your own folder untouched.