The language Venezuela requires
A certified translation into Spanish is required for documents used in Venezuela, so an English record from Nottingham needs a Spanish version filed with it. A certified translation into Spanish in Nottingham creates a second document and leaves the first one exactly as issued. Nothing is written on the source, and nothing about its standing changes.
Papers that point at other papers
Read almost any official sheet closely and it points somewhere else. An entry number. A reference to a register volume. A line naming an earlier certificate, or a case number from a court. Those pointers are part of the text, so they cross into the Spanish word for word — but the papers they point at do not travel with them.
What the Spanish can and cannot supply
The Spanish version reproduces the reference; it cannot produce the referenced document. Where the reading side wants the paper behind the number, that is a separate errand with its own source, its own signed certificate and its own page count. Working this out at the start is what stops a file going out twice, once short and once complete.
Where the Nottingham record comes from
Where a pointer leads back to a civil record, the certified copy is issued by Nottingham Register Office at The Council House, Old Market Square, Nottingham NG1 2DT. That office holds entries of births, marriages and deaths and prints copies of them; it does not translate anything and it does not certify a translation. A copy ordered from it can go to the translator, so the sheet you hold stays with you.
Cost and pace
The rate is about £25 for each page as issued, so a certified translation for Venezuela is counted on the sides you decide to include — which is exactly where the reference question bites. Standard production runs 2–3 business days once readable scans exist, and a 24-hour route is there for a close date. Adding a second document later means a second run rather than an extension of the first.