There is a singularity to this topic around the theme of the outsider and nation. This ‘outsider’ experience takes at least two quite distinctive forms.
One is concerned with the immigrant / asylum seeker and by extension with the so-called ‘immigrant community’.
The second is concerned with the conflict between regional identity and British identity, which includes Scottish, Welsh and Irish national identities in opposition to the idea of a “united kingdom”.
Looking at recommended films makes clearer the different directions it is possible to go in with this topic:
Films raising issues about immigration / asylum, etc
In This World
Films raising issues about the nature of personal identity in a “United Kingdom” include:
This film is jam packed with a classic soundtrack, sharp writing, brilliant performances, dark themes and a brimful of visual metaphors. IT is a classic film to study if you want to understand film language in contemporary British film.
Here is a very useful additional resource published by Routledge (The publishers of the AS and A2 text books)