Does anyone else recall a similar-looking British show?
Or it might been later episodes of this one. I never could make it past the start of series 2.
But the lighting and set decoration were very similar. So I would place the production in the late 70's/early 80's. I saw it on PBS in my childhood during that period; it was definitely British. It was about a lodger who moved into a boarding house with a long balcony/landing in the middle of the set. The plot line was very similar to the lyrics from "Hotel California". There was a cult that met in the lower-level storage room of the building where presumably an evil spirit resided. The landlord (or landlady) would ensnare new tenants into the occult. Everyone that was assimilated would walk around saying "Splendid" with their hands folded together - index fingers extended upward and touching at the tips.