I was merely pointing out that there are a number of international examples. As I said, my hon. Friend the Member for Ochil and South Perthshire will go through some of those in some great detail. This is not unusual in matters of constitutional import.
There is no doubt that a constitutional referendum on whether the United Kingdom should be part of the European Union carries constitutional implications. It is not unusual internationally, even in a federal or confederal state, to have more than a simple majority on such matters, and also reference to the various component parts of that state. If that is the case for a confederal or federal state, surely it should be so much more the case for a United Kingdom of four component nations.