Now that Lisbon is reality we\’ve actually got something interesting here.
It is true that Lisbon provides a route out, negotiations and the rest, if a country wants to leave the EU. And it would be complex and difficult because those \”negotiations\” would lead to our being entirely screwed if the FCO had their way.
However, do note that what has been passed is in fact simply a set of amendments to the original Treaty of Rome. It isn\’t in fact a Constitution, despite the fact that it contains just about everything first proposed.
But the fact that it is simply a series of amendments to the Treaty of Rome means that it\’s very simple indeed in British law to withdraw from it. Repealing the 1972 European Communities Act repeals the whole lot, amendments and all.
Including, of course, the tortured system for a country to leave.
This might actually be the only significant difference between the Consitution and Lisbon. Because Lisbon is now all part of the one same treaty it\’s actually easier for us to leave.
One vote and we\’re out.