A no frills film in keeping with the series, the genre and the time.
This is a film about edgy London police in an edgy London in the edgy 70's. You could of course substitute "edgy" for "dodgy" in the above sentence and it would still be true...
For those of us around in the 70's it, like the series, is fantastically atmospheric. The hair, the clobber (look out for Regan's green anorak), the boozers, the motors, the women.
The plot is far less important than the characters who are all superb, and a particular mention for the young (and very beautiful) Diane Keen, and to a lesser extent Linda Bellingham - whose nudity makes you look at those OXO adverts very differently (or it would if they were still on) The film also gives some extra scope to the relationship between Regan & Carter, and there are some edgy moments between the 2, starting with their morning-after-the-night-before and culminating in the dramatic ending and indeed the film's last words. One of the many things I liked about the Sweeney was its realism and how it didn't portray its main characters as heroes but showed their dark sides and their failures.
I loved the TV Sweeney, for me John Thaw's (God rest his soul) Regan is one of, if not the, best TV characters of all time and this is an appropriate and very satisfying movie length "episode" Hollywood it ain't guv'nor, and for me thats what makes it the boll***s.