Have you seen
Manor House? PBS series in which present day volunteers are trained to live the life of upstairs/downstairs at about the same time period that Downton Abbey takes place in. (I dare you to not love the butler.)
And of course Julian Fellows'
Gosford Park, which also features Maggie Smith. (And a certain former comedy partner of a certain actor.)
I recall a tour arranged of a country estate in England when I was there years and years ago on a bicycling tour. The lady of the house was showing us around when one of the more unique personalities, a retired teacher, makes herself comfortable on the furniture.
"That's 200 years old," the lady said, in a very Maggie Smith like manner. "We don't actually use it."