English is the working language
Australia reads and files in English, and a certified translation for Australia is what any non-English record needs before it is accepted there. Plenty of people moving from Reading already hold English paperwork, so nothing is needed for those pages. The pages that matter are the ones picked up abroad, still in the language of the country that issued them.
The certificate that travels with it
The accepted form is a certified translation with a certificate of accuracy. The translator signs a short page saying which language the source was in, which language the text is now in, and that the second says what the first says. That signed page, and not the letterhead above it, is what an Australian reader looks for. An official English translation in Reading is finished the moment the certificate is signed.
What a page costs
The rate is about £25 per page of the source, and you know the page count from your own scan before anything begins. Standard turnaround is 2-3 business days. Express work returns within 24 hours. A dense page and a sparse page cost the same, because the count follows the sheet rather than the number of words on it.
Leave the paper at home
Never put an irreplaceable record in the mail for a translation job. A clear scan gives the translator everything, and the certificate refers to the copy you sent. Where the page is a UK civil record and a fresh paper version is wanted as well, Reading Register Office at Civic Offices, Bridge Street, Reading RG1 2LU issues certified copies of birth, marriage and death records.