Downton Abbey is the very best, just excellent. Call The Midwife is good; Foyle’s War is too, but think that series has ended. I watched it on Netflix, so not sure about that.
Mr. Selfridge and The Paradise (series ended) are both good except for the occasional too-liberal bent.
British shows/movies are usually so well done. Great acting, script, production. First-rate.
I gave up on Mr Selfridge because I did not care what happened to any of the characters. No matter how visually impressive a series is, the characters have to intrigue. You must care about some of them, and I found them all...yawn inducing.