I'll Sleep When I'm Dead -- Did I miss something?

This post contains spoilers for "I'll Sleep When I'm Dead", although probably you shouldn't care because it's a crap film. Proceed at your own risque.
So, what's with this film? Does my DVD only contain the first 3/4s of the movie or did it not have an ending? They've got this whole slow run-up to the ultra-badass Clive Owens returning to London (Brixton, actually). He's so bad that the local mob starts arming up in fear at what he might do to those responsible for his brother's death. They hire a special assassin to stake out his girlfriend's house to kill him when he appears. Everyone's afraid of him.
And what does he do? He gets a haircut and gets his antique Jag out of storage. He tracks down and shoots one dog and one bad guy. Then he goes out and stands on a beach watching some guy hit golf balls into the surf.

This is the result of his righteous anger at his brother's killing himself after being brutally raped.
In the end, the mobsters are left hanging around London. The hired Irish assassin is left sitting on the stairs of the girlfriend's house with the girlfriend at gunpoint. All the hired muscle from Clive's old mob, from the enemy mob and from the bad guy who got the brother killed... Well, they're just left to their own devices, ignored by the plot.

So, did they run out of filmstock? Money? Screenplay? Did they just decide a cool ambiguous ending was better than, say, an actual ending? Are we supposed to picture a room full of movie producers locked in eternal combat, fighting over how the film will end?
Not only is there no plot resolution, no big shoot-'em-up ending, there's no moral resolution, no closing emotion: we don't know if Owen is heading back to the girlfriend's house to be killed, or if he's just driving off into the sunset alone. We don't know if he intends to return to his mobster ways or make a new clean break with the girlfriend. Is it true, as one character tells him, that men like him cannot change, or has he truly changed but doomed by the change?
How could anyone have thought that this was a satisfying or reasonable ending to what could have been a decent film?
Alan Brooks

A with an Underwood
I'll watch this again
when I'm dead.
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