"Pre the vote we were told that the pound would 'tank"

AS is often the case with the right wing you are trying to rewrite history Nigel. The pound went from 1.32 euro to 1.20 euro overnight.

In a financial market were a rise of one quarter or one half of a cent is claimed to be soaring or plummeting I would suggest a fall of 12 cents can be said to have tanked.