The stilted English is because it is source material produced by a German university.
No culture is exactly homogeneous.
That hardly needs stating.
It can still be informative to describe aspects of a culture, and British Pakistanis are a very culturally distinct group.

We are all used to discussing the fact that there are two culturally distinct groups within the racially homogeneous population of Northern Ireland.
Alan has alluded to aspects of working class culture, sometimes derogatorily referred to as chav culture, within the white British community.