Primark has been a major name on the UK high street for many years, but fast online retailers such as Shein and Temu are changing how young people shop. This blog explores why Shein is growing so quickly, why some shoppers still prefer Primark and the challenges Primark now faces. It also looks at how ethical concerns, convenience and changing habits are reshaping the fast fashion market. This is a useful case study for students learning about consumer behaviour, competition,