Dr. David Owen (Plymouth, Devonport) : Is it not perfectly clear that what was being attempted at Rome was a bounce which led only one way-- to a single federal united states of Europe? Is it not vital that, in this House and across party lines, it should be possible for a Prime Minister to make it clear, if necessary, that Britain is prepared to stand alone? We should not relish it, but if we were faced with the imposition by treaty of a single currency and with a situation that prevented the enlargement of the Community to include Poland, Hungary and Czechoslovakia, would not Britain be entitled and right to use the veto?