“It’s always the quiet places where the mad shit happens,” observes Garda Lisa Nolan (Ruth Bradley) in Northern Irish director Jon Wright’s creature feature. And, credit where it’s due, the mirthfully monikered Grabbers presents us with some classically mad shit. Set on the fictional Erin Island - a fishing village off the coast of Ireland - Grabbers is Wright’s second feature after 2009’s Tormented.

Each episode of Southland – the best American cop show since The Shield – begins frenetically and never lets up – except for a freeze-frame in the first minute which the rest of the show spools back to explain. In this first part of the fourth season, one of LA’s finest is out of his black-and-white and chasing a suspect within seconds as his partner careers down the back alleys of South Los Angeles.

Often portrayed as corrupt or, at best, on the front line of a war zone, the officers of the LAPD are regulars on the big and small screen. On TV, Southland and The Shield have examined the LAPD in microscopic detail and earlier this year Rampart intermittently impressed with its focus on one cop in freefall. With police procedural End of Watch writer-director David Ayer is on home turf: he’s the man behind several LA-set police thrillers, including Training Day (for which he penned the screenplay).

If you saw previous Nick Love efforts like The Football Factory or Outlaw, you'll know he likes nothing better than a lairy swagger down Geezer Street while slaughtering innocent bystanders. He's at it again here, with this glaringly unnecessary remake of  Seventies cop show The Sweeney, a TV institution that very nearly justifies the use of the crassly abused-to-death term "iconic".

Sometimes when we reconnect with the television of our childhood it seems very different from what we recall, usually lesser in some way. This is certainly not the case with the physical violence of The Sweeney. ITV's hour-long special, to coincide with the release of a new feature film, showcased a mass of beatings, snarling assaults, and men taking limb-breaking leaps into quarries rather than face the actors who went on to play Inspector Morse and Minder.

A sense of déjà vu strikes from the very first shot. It is a dark and stormy night. A lone man staggers down an empty street through the lashing rain. Once indoors we see he has blood on his hands. A minute has not yet passed but Warren Brown – for it is he – tears his shirt off. Before we can admire the size of the former cage fighter’s guns he produces a real one. Roll titles.

On Thursday the BBC will screen the opening episode of the television drama Good Cop. I finished writing it back in August 2010, and on the strength of that story and ideas for a total of four episodes, the series was green-lit in February 2011. We completed filming (pictured below) by the end of December 2011, then came post-production. Now at last we have our transmission date and it will be broadcast to the world.

It’s not usually a good sign when the second series takes two years to materialise. Vexed , a comedy drama with corpses, took its first bow a couple of years ago. It offered Toby Stephens as DI Jack Armstrong, a detective from the old school who’s rather more mouth than trousers. There can’t have been much confidence in it back then: August is the cruellest month for fresh television content when the target audience is generally off on its hols.

At the end of episode four, we left ferret-faced copper Steve Arnott (Martin Compston) seemingly having his fingers hacked off with a bolt-cutter by a gang of hooded thugs and their poisonous little child-sidekick, Ryan. Boringly, the glum and dislikeable Arnott was rescued in this finale when the supposedly corrupt DCI Gates organised a police rescue, and got away with all his fingers mostly intact.

Those quaint old TV shows in which we were invited to support and admire the police unreservedly have long been overtaken by real-life events. Now evolution has brought us to Line of Duty, a series that presents the police as a failing bureaucracy hamstrung by paperwork and political correctness. From what one gathers of how our contemporary rozzers operate - inviting you to report crimes by email, for instance, because police stations are only open some of the time, or arresting victims instead of perpetrators - this may be unpleasantly close to reality.