what is a British Film?

As critic McDougall (2008) states there are various 'official' ways of categorising British films. The most common is through using the following categories defined by the BFI (British Film Institute):

Category A: Films made with British money, personnel and resources.

Category B: Films co-funded with money from British and from foreign investment, but for which the majority of finance, cultural content and personnel are British.

Category C: Films with mostly foreign money (but non USA) investment and a small British input either financially or creatively.

Category D: Films made in the UK with (usually) British cultural content, but financed fully or partly by US companies.

Category E: US films with some British involvement. 

british:

• harry potter and the deathly hallows part2 
• bad education 
• The chronicles of narnia: The voyage of the dawn treader 
• nanny Mcphee 

American : 

• the last song 
• 10 things i hate about you 
• high school musical