Erm, it's like this...

Now that Article 50 has been triggered and the clock is running, the question of the moment seems to be - can we change our mind?  As negotiations progress, if we don't like the way they are going and start to fear the eventual outcome, can we withdraw our Article 50 letter?  The Lisbon Treaty (which introduced Article 50) is silent on the subject.  It would certainly be strange if we could be forced to leave at the end of the two-year period, against our will,  It's all a bit worrying, isn't it?