Brexit and the British Pound

Sharp drop of the Pound suggests market wariness of a potential UK exit from the EU:

http://www.telegraph.co.uk/finance/economics/12167981/Pound-suffers-biggest-drop-in-almost-a-year-as-Boris-Johnson-sparks-Brexit-fears.html

http://www.wsj.com/articles/first-britain-then-denmark-betting-on-brexit-risk-1456117261 [gated]