Kes (1969)
Kes is a 1969 drama film directed by Ken Loach and produced by Tony Garnett. The film is based on the 1968 novel A Kestrel for a Knave, written by the Barnsley-born author Barry Hines. The film is ranked seventh in the British Film Institute's Top Ten (British) Films and among the top ten in its list of the 50 films you should see by the age of 14.
More at Wikipedia.