Detective Sergeant Tom Brant (portrayed in this movie by Jason Statham) is a character in a series of novels by Ken Bruen. This movie is an adaptation of one of them.
The screenplay for this film was featured in the 2007 Blacklist, a list of the "most liked" unmade scripts of the year.
The first film production by Lionsgate UK.
In the original novel, each chapter is devoted solely to one character. Obviously, this had to change for the film adaptation.
In this film, Statham & Evans play friends who owe each other favors. In the Fast & [the] Furious franchise, they play the Shaw brothers; Deckard & Owen.