Anne Boleyn
New and upcoming (2026 and later)
Out this year, or not out yet.
Philo
AMC Plus Apple TV Channel 
The last five years (2021 to 2025)
Current, and all of it watchable now.
A Very British Scandal
Amazon Prime Video
Five to fifteen years back (2011 to 2020)
Recent enough that everyone can still find it, old enough to be finished.
Black Narcissus
Not streaming in the US
Older than fifteen years (before 2011)
The back catalogue, where the closest match often is.
Britbox Apple TV Channel 
The Roku Channel
BritBox
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Name three shows you loved and it ranks the whole catalogue against your taste rather than against one title.
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