Blimey - now there's a topic and a half!
You might find it easier to limit the scope - maybe choosing a decade or a director or two (both your examples are from Leigh and he's a good choice). The 'obvious' choice would be the late 50s early 60s - Room at the Top, Saturday Night & Sunday Morning etc. - but there is quite a lot of work on these (I'd recommend John Hill's book, the title of which escapes me at the moment). Also, they don't quite fit your definition, as these were mainstream films and very successful at the box office.
I'd suggest concentrating on 1979+ (the Thatcher years onwards) - the notion of the 'working class' becomes heavily politicised from this period onwards, e.g. the sale of council houses to create a property owning, Conservative voting middle class; the closure of many mines & factories... What's notable is that many of the more recent films are set in the past (Billy Elliot, Full Monty), referring to the 80s in particular.
You might also want to consider TV as a comparison point - such as soaps (UK soaps are predominantly working class, unlike US soaps), Only Fools and Horses, Bread.

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