I have to say I thoroughly enjoyed Upstairs, Downstairs.  The characters are true to life for the era they were portrayed in.  The loyalty of the upstairs to the downstairs and the reverse was wonderful to watch.  The actors were excellent.  I completely got the feel of the way they lived and why they had their roles to follow and followed them flawlessly.  There were one or two exceptions but those belonged to the storyline.  I would recommend these videos.