I would say my favorites (mostly British) are:
Cracker
Prime Suspect
Morse
Some of my other favorites are the original version of Bron/Broen (The Bridge).
Dalziel & Pascoe
Vera
Trial & Retribution
Wallender (Swedish original version)
A Mind to Kill
Touch of Frost
Case Histories
Broadchurch
Happy Valley
I also like the legal drama “Silk”
More, but brain is fried from humidity today.
We enjoyed The Tunnel.
I enjoyed Professor T., also. Humorous police work about an extremely germophobic professor who helps the police. The original is Belgian. Haven’t seen the remakes.
“The eccentric but brilliant criminology professor Jasper Teerlinck is an advisor to the Belgian federal police in Antwerp. Although a valuable contributor, he drives everyone nuts because of his strange behavior.”
https://www.imdb.com/title/tt3823996/?ref_=nv_sr_srsg_4
I’m surprised no one has mentioned the Irish Garda drama, “Single Handed”
What a great watch.