My vague argument is no more vague than you quoting an individual bit of economic data, the value of sterling cannot be a true indicator of our economies worth, otherwise it wouldnt have been over valued pre referendum.
Why dont you use your same logic on snippets of EU data and see how it fairs ?
Yes, yes that'll be it. the pound was simply over valued and this economic nose dive is just a minor adjustment. Brexiteers wonder why they are mocked on here!