'(1) ... (a) a document, duly authenticated, which purports to set out evidence given on oath in a designated Commonwealth country... shall be admissible as evidence of the matters stated therein; (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 any such country... shall be admissible in evidence...
'(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 aforesaid, if the document purports to be certified by a judge or magistrate or officer in or of the country or dependency in question to be the original document containing or recording that evidence or a true copy of such a document... 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 designated Commonwealth country...'
'the burden is... to satisfy the court on a balance of probabilities, but what has to appear has to be merely that the [appellant] might if returned be dealt with in a certain way. As it seems to me "might" there does not mean "might" as a matter of mere possibility but it is for this court to say: has the [appellant] satisfied us that there are substantial grounds for thinking that he might be dealt with in a particular way?'