Best critiques of British empire among postwar UK fiction film(s)?

Gandhi and what else?

It doesn't seem to me that the very reasonable, democratic, fair-minded, scholarly, truth-seeking British have done much of anything cinematically to debunk their own mythology.

Can you think of any films that depict the brutality, oppression, economic exploitation, avarice and hypocrisy that characterized so much of British imperial rule?

What about films that are set against a background of British decolonization and which don't take pains to showcase British virility?