The six new episodes will see the team still striving to broadcast the stories they believe in as they grapple with the looming spectre of the Cold War and changing social mores.The series will chart political intrigue and corruption against the highly charged backdrop of a country in the grip of unsettling and rapid change. With the space race and nuclear power, Britain seems on the threshold of a new era of modernisation, economic optimism, scientific progress and cultural change in the face of new immigr…