These stores:
Boots,
Tesco,
Asda,
Primark,
Argos,
TK Maxx,
Poundland,
Arcadia group of stores run by billionaire Sir Philip Green, which includes Top Shop and Burton,
are all using 'workfare' schemes, forcing jobseekers to work 30 hrs/week unpaid for 6 months in profit making companies or face losing their jobseekers benefits. Mre details here.
Please avoid shopping in these shops as much as possible, this is basically slavery and is illegal under human rights law (and currently being challenged in the courts).
The good news is that Waterstones and Sainsburys have recently pulled out of the scheme.