Ahmed Ali has just returned to his home in Britain after helping to set up a friend's coffee shop in Berlin. He could become one of more than 300,000 Britons who work in other EU countries. This is his personal perspective on Britain's EU referendum.br Click here to subscribe to The Economist on YouTube: br br In our "On Diary" series, three Britons share what is at stake for them if the country votes to leave the EU in its referendum on June 23rd.