This year marks the 50th anniversary of one of the most remarkable feats of exploration in the history of humankind, which landed men on the moon. While Neil Armstrong and Buzz Aldrin were setting foot on the moon’s surface, Michael Collins was piloting the command module which got them all home. In a special edition of HARDtalk, Stephen Sackur spoke to Michael Collins at his home in Florida. How does he reflect on the significance of that extraordinary mission?