Downton Abbey! My DM watched it and thought it was good so told me to watch it. I recorded it on our tv box but never got round to watching it then we moved house and lost the recordings. Watched it for the first time a few years ago and I’ve watched the whole lot multiple times plus all the films - it’s one of my comfort watching programmes now.
Foyle’s War - DH loves this and has them on DVD, I’d never seen them but love them too now.
And The Good Life, which is from the 70s but was rerun when I was early teens on Sundays around the same time as the Sunday soaps were on, I used to watch them with my nan.