I am a Brit abroad at the moment and watching this series made me feel my English roots again !  The class structure, the changes that came with the 1914-18 war, the entrenched attitudes that resisted the changes and the frustration felt by those bringing in the new ideas.  Post Traumatic Stress Disorder is also there and made me so sad that it was not recognised for what it was.  But the most beautiful thing about all these episodes is of course, the relationship between upstairs and downstairs.  It makes one aware that the boundaries of what we consider family can stretch and stretch.  The actors are superb and I wonder where they are now.  It is just a perfect slice of England and the English with all our prejudices and funny ways of doing things - stiff upper lip, public school - but everyone just muddles along and makes their way through all the turmoil.  A really fine series that I will enjoy watching again and again.