Shortly after polls closed at 10pm on Thursday the pound rocketed to 1.50 dollars, its highest performance of 2016.
The latest data shows sterling at less than 1.36 dollars.
Joe Rundle, head of trading at ETX Capital, said: “We’ve never seen anything quite like this.
“Sterling has dived from a high of 1.50 dollars to below 1.36 dollars in a matter of hours.
“These moves are pretty well unheard of but will only get worse if Leave does win, which it is looking increasingly likely now.”
