I recommend anyone here interested in the British gangster scene to watch the film "Rise of the Footsoldier" its a true story of the Essex underworld in the 1990s, very raw violent film def worth a watch!
Good film although not entirely 100% accurate from what i have read, close enough for a movie none the less.
Bonded By Blood is a newer movie with a similar storyline about the Rettendon Range Rover murders. Not as good as Rise Of The Foot Solider though.
Bonded By Blood Trailer