It's generally accepted that we're in the middle of a golden age of television - particularly television drama. While feature films - particularly in America - are leaning to the conservative and risk-averse, the small screen seems to revel in diversity. TV series are coming from all over the world - Denmark, Sweden, Britain, Israel, Germany. The only hiccup is we now have to pay for it. Simon Morris asks Lightbox executive Maria Mahony whether we're losing a common culture with all these TV platforms.