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I think that the people were chosen to show how different types of people cope with their crappy lives and to show how all sorts of people are affected. The lady in question did get very upset and without chivvying may well have put it off and things could have gotten worse, to her, the bank charges were astronomical and upset h carefully formulated budget. I think the programme did an excellent job of showing different types of struggling families, that all sorts of people struggle - not just perceived 'chavvy scum'c