The NMC names no translator qualification, accreditation or professional register anywhere in the guidance we checked. It asks only for "a translation service" and contact details. It is also silent on sworn translators, apostille, legalisation and notarisation. Silence is not approval: where the guidance says nothing, no one can promise the NMC will take a particular translator's work.
The NMC also does its own checking. It contacts your education institution to confirm your qualification against their records, and if you were registered abroad it contacts your regulator directly. If your regulator cannot confirm your registration, for example if you have not completed a registration examination, the NMC says it may not be able to accept your eligibility application. The guidance quoted on this page is the trained-outside-the-UK route for nurses and midwives.