What was the the coming-of-age drama released in 2006 which stars one of the co-starring actors of British thriller film Tower Block?
Tower Block (film):  The film stars Sheridan Smith, Jack O'Connell, Ralph Brown, and Russell Tovey and entails residents of a block of flats targeted by an unseen sniper after witnessing the murder of a teenager. Jack O'Connell (actor):  Born and brought up in Derby, he trained in acting at the Central Junior Television Workshop in nearby Nottingham, which led to roles in film, television, and theatre.
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