Technically the title is W-Delta-Z but who knows how to do a capital delta on their keyboard? Even the distributors called it Waz - the copyright is 'Waz Distribution Ltd'.
Looks and feels like one of those modern, gritty US cop shows but incredibly this was mostly filmed in Belfast and most of the actors are British, apart from Stellan Skarsgard (Swedish), Melissa George (Aussie) and Selma Blair (a real Yank).
I quite enjoyed this, but possibly because I've never seen it's stylistic influences. It's often called 'Seven meets Saw' but I have no intention of ever watching any Saw film and I can't stand David Fincher movies. And I don't watch any US cop shows.