I think one has to be a little careful not to project the UK's constitutional settlement onto the rest of the world. I quote from Tom Bingham's book, 'The Rule of Law':
'Our acceptance of parliamentary sovereignty, by contrast, distinguishes us from all other members of the European Union, the United States, almost all the former Dominions and those former colonies to which this country granted independent constitutions. In all these countries the constitution, interpreted by the courts, has been the supreme law of the land, with the result that legislation inconsistent with the constitution, even if duly enacted, may be held to be unconstitutional and so invalid.'
Hence the recent referral of German support to the euro-zone bailouts to their constitutional court.