By Andy Bruce LONDON (Reuters) – There is trouble ahead for Britain’s new finance minister Kwasi Kwarteng: a marked shift in how British assets are behaving in markets points to growing unease about the economy’s vulnerabilities. Investors around the world have typically capitalised on weakness in the pound in the past to snap up British equities and government bonds. But that has not been the case recently as the FTSE 100 share index and gilts have moved in step with sterling, unlike after the 2016 Brexit vote when the pound’s drop lured buyers, for example. GRAPHIC-UK assets have moved in sy…