Who issues the record
Southampton Register Office holds the civil records for the city — births, marriages and deaths — and issues certified copies of them from 6a Bugle Street, Southampton SO14 2AJ. That is the whole of its part. It reads no Portuguese, signs no translation, and takes no view on what will happen to the file once it leaves the country.
Who signs the Portuguese
The second hand belongs to the translator. A certified translation in Southampton for Angola is produced by a certified translator who turns the English into Portuguese and then signs a certificate of accuracy for the work. The signature names a person and a date, so every sheet can be traced back to whoever did it. Sworn status plays no part on this route.
The gap nobody fills
Between those two hands sits a gap, and the gap is yours. No one chooses which papers you need. No one watches your deadline or keeps the set in order after delivery. A certified translation into Portuguese in Southampton arrives as a pair, text and signed certificate, and holding that pair together until it is filed is the last job on the list.
Cost and clock
The translation rate is about £25 / page, so the number of sheets, not the subject matter, sets the price. Standard delivery runs 2–3 business days and express delivery lands within 24 hours. Weekends are not counted, so the day you order shifts the day it arrives. The register office charge sits outside all of that arithmetic.