The line that sends people here
Most forms carry one sentence about language, and it does all the work. A line of roughly this shape is the usual one — an illustration, not a quotation from any particular form: papers not in English must be accompanied by a certified translation. Four clauses, four separate decisions, and pulling them apart makes the order obvious.
Clause one: not in English
A certified translation into English is required for documents used in the Philippines, so the target language is settled before you start. That makes a certified translation into English in Southampton the shape of the order, and leaves only its scope to be worked out. The clause reaches sheets in another language and leaves the rest untouched, which is why the first job is sorting your set by the language printed on each page.
Clause two: certified
Certification here is a signature, not a stamp sold over a counter. A named certified translator writes the English and attaches a certificate of accuracy, dated, saying the English carries the content of the source sheet. That is the whole of it. A certified translation in Southampton for Philippines is exactly that pairing of text and signed statement.
Clause three: accompanied by
The two papers get read side by side, so neither one travels alone. For a birth, marriage or death record, a fresh certified copy from the register office named above stands in for your own certificate, and your certificate stays at home. For any other paper, work from a clean scan and hold on to the sheet yourself.
Clause four: by a qualified translator
The last clause names who may sign, and it is narrower than people expect. An official English translation in Southampton is signed by the certified translator who produced it, and no court register stands behind that name. Pricing then follows the page: about £25 / page, 2–3 business days as standard, and 24 hours if you take the express route.