British movies I have enjoyed include..
Layer Cake
The Big I am
Snatch
lock, stock & two smoking barrels
Kidulthood ( and its sequel, adulthood )
A Clockwork Orange ( classic )
Trainspotting
Harry Brown
He died with a felafel in his hand ( Australian movie but so good )
Kikujiro ( Japanese movie, incredible in Japanese with subtitles )
Oldboy ( Thai or Korean movie, avoid the American remake )