Read my Blog posted on 30 December 2010 and you will see that I predicted a NO vote in the AV Referendum, giving reasons. At that time, the outcome did not seem a foregone conclusion.
What we are seeing is a crisis of falling expectations. The vote is for Old Coruption and Business as Usual.
God Save The Queen - especially as the Royal Wedding orgy of reactionary values probably swung many waverers into the NO camp.