Just what makes Germans so successful? They work fewer hours, yet they are more productive and their economy is the most successful in Europe. Even David Cameron says we should strive to be more like them.  In a bid to discover their secret, Justin and Bee Rowlatt head to the manufacturing city of Nuremberg with two of their children. Under the tuition of advertising expert PJ, whose company has done detailed research into the typical German, they set out to live, work and socialise the German way.