It seems now almost literally unbelievable that in our recent history an armed frontier divided a major European City marking a global contest between democracy and communism. Many people have offered their reflections today, far more eloquently than I can manage. David Cameron and Margaret Thatcher have both given their thoughts, but I give the last word to German Chanceller Merkel, herself from East Germany:
'Today marks a truly happy moment of German and European history. Twenty years ago the door to freedom opened up and a seemingly invincible wall that divided a people and an entire continent suddenly became permeable. It was one of the happiest moments of my life. '