27.—(1) In any proceedings under this Act in relation to a person whose return has been requested by the United Kingdom, a designated Commonwealth country, a colony or the Republic of Ireland, including proceedings on an application for habeas corpus in respect of a person in custody under this Act—
(a)a document, duly authenticated, which purports to set out evidence given on oath in the United Kingdom, a designated Commonwealth country, a colony or the Republic of Ireland shall be admissible as evidence of the matters stated in it;
(b)a document, duly authenticated, which purports to have been received in evidence, or to be a copy of a document so received, in any proceeding in the United Kingdom, any designated Commonwealth country, any colony or the Republic of Ireland shall be admissible in evidence;
(c)a document, duly authenticated, which certifies that a person was convicted on a date specified in the document of an offence against the law of, or of a part of, the United Kingdom, any designated Commonwealth country, any colony or the Republic of Ireland shall be admissible as evidence of the fact and date of the conviction.
(2) A document shall be deemed to be duly authenticated for the purposes of this section—
(a)in the case of a document purporting to set out evidence given as mentioned in subsection (1)(a) above, if the document purports to be certified by a judge or magistrate or officer in or of the United Kingdom or the Commonwealth country or colony in question or the Republic of Ireland to be the original document containing or recording that evidence or a true copy of such a document;
(b)in the case of a document which purports to have been received in evidence as mentioned in subsection (1)(b) above or to be a copy of a document so received, if the document purports to be certified as mentioned in paragraph (a) above to have been, or to be a true copy of a document which has been, so received;
(c)in the case of a document which certifies that a person was convicted as mentioned in subsection (1)(c) above, if the document purports to be certified as mentioned in paragraph (a) above,
and in any such case the document is authenticated either by the oath of a witness or by the official seal of a Minister of the United Kingdom or the designated Commonwealth country or the Republic of Ireland or of the Governor or a Minister, secretary or other officer administering a department of government of the colony, as the case may be.
(3) Nothing in this section shall prejudice the admission in evidence of any document which is admissible in evidence apart from this section.