"We do not doubt that prison conditions in Iran are far from ideal. We do doubt that they may not measure up to what is expected in this country or perhaps in any country which is a signatory to the European Convention on Human Rights. As the Court at Strasbourg has recognised, it is not for signatories of the Convention to impose the standards of the Convention on all the world. Recognition has to be had to the situation in individual countries and to the standards that are accepted and expected in those countries. Of course in relation to Article 3 there is a line below which the treatment cannot sink, if we may put it that way"