Been there, done that. That's how Upstairs, Downstairs ended, with the crash of 1929 and the Bellamy family became broke after James lost all his money and then killed himself.
Yeah, you're right. It's been 30-something years since I saw that, and probably not all of the episodes then. My wife and I were watching it a few years ago but only got through the first series when Netflix dropped it. What a great show that was, though.