An innocently-intended Friday night out turns into something fearsome indeed in I See You, a Royal Court co-production with the Market Theatre, Johannesburg, that puts the tensions of post-apartheid South Africa under a sorrowful microscope.

“It’s routine, it’s procedure.” “It’s wank, it’s toss.” As you can tell, Happy Valley is back. If Sally Wainwright made bespoke ironmongery or dry stone walls or exceedingly good cakes, her work would come by royal appointment. Instead you can tell she’s good because she accumulates awards, including most recently a couple of BAFTAs for series one, and attracts actors from the farthest-flung corners of northern drama such as Cucumber and Downton’s downstairs, all gagging to speak her pearly dialogue.

Some things never change. Once more, we join DCI John Luther – though only for a two-part special – as he glues himself to the trail of a serial killer. And once again Luther is played by Idris Elba, a man who can freeze time or make villains throw down their weapons merely by gazing into the camera with an expression of quizzical world-weariness.

This is the first of two new TV series this week to feature a female police officer investigating the discovery of long-buried skeletons (the other one is Thursday's Unforgotten on ITV). The two shows are different in tone, but still reminiscent of numerous noir-ish policiers of recent vintage. It makes you wonder whether commissioning editors are trying hard enough. We hear a lot of earnest talk about "diversity", but it doesn't seem to apply to themes and subject matter.

Its title may hint at exotic worlds – a Western, even – but Robert Carlyle’s directorial debut is anything but. Carlyle himself plays the title character, one of life’s losers (“haunted tree” being one of the more memorable descriptions we get of him) who’s barely getting by as a Glasgow barber until the story, and his own unplanned actions, pitch his mundane existence to another level altogether.

Last year's debut series of True Detective starred Matthew McConaughey and Woody Harrelson in a fascinating slice of metaphysical Southern Gothic. That's all gone now though, because this time, writer Nic Pizzolatto has shunted the action out to the West Coast, to a small fictional city in the shadow of Los Angeles called Vinci. Apparently Pizzolatto based it on real-life Vernon, California, a city infamous for its history of endemic corruption.

Drama is all about secrets revealed, discoveries unfurled. Black Work was straight into that territory from the first scene. A man and a woman sat in a car, taking the solace from each other that they couldn’t find at home. As ever in such a scenario, you promptly wondered if or when they’d be caught in the act. This was especially so given that the woman was played by Sheridan Smith, who starred in just such an adultery drama not that long ago.

This is supposed to be a major five-part documentary series probing into the innards of the Metropolitan Police, but it felt suspiciously like W1A in uniform. Was it the muted but insistently ominous background music, always trying to tell us that something really significant was happening when we were just watching yet another slab of b-roll footage? Or the dry, earnest voice-over, intoning that "this is a force under pressure"?

Today, terrorism means killing as many innocent people as possible. Fear is created by completely random attacks, so that no one feels safe. But there was a time, in the past, when political anarchists would focus their attacks on selected targets and avoid civilian casualties. For a year, begining in August 1970, the Angry Brigade brought armed struggle to Britain, setting off some 25 bombs, mainly aimed at the property of the rich and powerful (although one person was slightly injured).

There’s been much hullabaloo surrounding the new series from Paul Abbott – and with good reason. It’s a decade since we’ve seen any TV from the creator of State of Play and Clocking Off and, given the impact and lasting legacy of Shameless, anticipation has been as high as Frank Gallagher at the business end of a three-day bender.