The wife and I are both hooked on the Agatha Christie Hercule Poirot series, and of course the Jeremy Brett Sherlock Holmes, both from Granada TV. We have purchased all of the DVD's including the just released Poirot set which finally included the Murder on the Orient Express.
In days past I grew up watching the Avengers, the Saint and The Prisoner. Later I used to watch the Lovejoy series, Coronation Street, Are You Being Served?, and some others. Also, the Cash in the Attic and Bargain Hunt antique shows, especially the David Dickenson episodes. I have never been much for British comedy of the Benny Hill sort, but when they were growing up our kids loved Mr. Bean.
When we moved from Canada to the USA, one of the biggest losses I felt was I could no longer watch snooker on TV which was a weekly thing (watching and playing) for me back then. Can't even find a snooker table in the USA anymore, and fewer in Canada as well.