“A person’s extradition to a category 2 territory is barred by reason of the rule against double jeopardy if (and only if) it appears that he would be entitled to be discharged under any rule of law relating to previous acquittal or conviction if he were charged with the extradition offence in the part of the United Kingdom where the judge exercises his jurisdiction.”
“18. In summary the authorities establish two circumstances in English law that offend the principle of double jeopardy: (1) Following an acquittal or conviction for an offence which is the same in fact and law- autrefois acquit or convict; (2) Following a trial for any offence which was founded on “the same or substantially the same facts”, where the court would normally consider it right to stay the prosecution as an abuse of process and/or unless the prosecution can show “special circumstances” why another trial should take place.”
“A person’s extradition to a category 2 territory is barred by reason of the passage of time if (and only if) it appears it would be unjust or oppressive to extradite him by reason of the passage of time since he is alleged to have committed the extradition offence or since he is alleged to have become unlawfully at large (as the case may be).”
“If a person’s proposed extradition for a serious offence will separate him from his family, Article 8(1) is likely to be engaged on the ground that his family life will be interfered with. The question then will be whether the extradition is nevertheless justified pursuant to Article 8(2). Assuming compliance with all the relevant requirements of domestic law the issue is likely to be one of proportionality: is the interference with family life proportionate to the legitimate aim of the proposed extradition? Now there is a strong public interest in “honouring extradition treaties made with other States” (Ullah, paragraph 24). It rests in the value of international co-operation pursuant to formal agreed arrangements entered into between sovereign States for the promotion of the administration of criminal justice. Where a proposed extradition is properly constituted according to the domestic law of the sending State and the relevant bilateral treaty, and its execution is resisted on Article 8 grounds, a wholly exceptional case would, in my judgement, have to be shown to justify a finding that the extradition would on the particular facts be disproportionate to its legitimate aim.”