VUCA. Volatility, uncertainty, complexity, ambiguity. Courtesy of a US Army think-tank, we have an acronym originally conceived as a way to describe the uncertainties of a post-Cold War world. As we head towards the uncertainties of a post-Brexit Europe from 1 November, VUCA is the reason that the value of the pound is sinking ever lower as investors seek a safe haven from an event whose outcome they can’t predict.