If the registrar considers it necessary or desirable, he may use the services of an interpreter (not being one of the civil partners or a witness).
The interpreter must—
before the registration of the civil partnership, sign a statement in English that he understands, and is able to converse in, any language in respect of which he is to act as an interpreter, and
immediately after the registration of the civil partnership, give the registrar a certificate written in English and signed by the interpreter that he has faithfully acted as the interpreter.