Oh and CSI: Special Victims Unit (more so the older episodes) are good
and The Practice, seasons 1 to 4ish (it's set in a law firm in the late 90s early 2000s)
and it's spin-off Boston Legal (although that's got a lot of comedy too)
The Capture from BBC is also good (hurry up and watch that)
Line of Duty has already been mentioned...