Channel 4 aired the pilot episode to this a while ago, maybe a fortnight or so, and the rest is currently on All 4 (Is that what 4OD is called now?)
For those missing their Killing/Bridge/Borgen fix, this is a perfectly good substitute.
6 episodes:
http://www.channel4.com/programmes/eyewitness
And a promo because promo:
Oh apparently there was a US remake already. I assume that was terrible!