Shows I’ve personally enjoyed include:
Dalziel and Pascoe
Inspector Alleyn Mysteries
Lord Peter Wimsey Mysteries
Father Brown (the 70s one)
Danger Man (AKA Secret Agent)
Maigret
The Mind of Mr. J.G. Reeder
Campion
New Tricks
Callan
Man in a Suitcase
Van Der Valk
Taggart
Special Branch
Inspector Morse
Midsomer Murders
Jonathan Creek
BBC series “The Carpetbaggers”
Another one found on Netflix was The Last Detective starring Peter Davidson (5th Doctor) as Dangerous (because he wasn’t)Davies as the last detective wanted on a case. At times I could related to the character a lot.