Be it a Highclere Castle type affair, a minor country estate in Somerset, maybe some kind of Tudor manor house.
I'm watching The Little Stranger which is set post-WWII and shows a family who can very much not afford to keep the family seat going. It's all dust and decay and slogging away doing their own cooking and cleaning.* God, it's so depressing watching these people in their ramshackle home with the days of former splendour still in living memory. They don't have so much as a ladies maid to throw a hairbrush at anymore.
And I know these houses could only exist for so long because they were able to exploit their servants by paying them two shillings and thrupence and only giving them a half Sunday's holiday every six weeks. But it's still quite poignant.
And then I thought, there must be lots of people living in nice comfy four bed semi-detached houses whose ancestors at some point lived in some seriously impressive gaffs. Do they have framed sepia pictures of the old ancestral pile on the wall?
*These poor buggers also have the added hassle of some ghostly demon.