In his factory in Chittagong, Bangladesh’s main port and trading hub, Mostafiz Uddin has a mountain stacked high of 100,000 pairs of jeans with nowhere to go. The piles of denim – stonewashed, black, skinny fit, turn-ups, shorts and more – had been destined for shops on UK high streets owned by Philip Green’s Arcadia empire, to satisfy our seemingly unquenchable thirst for fast fashion.