Bottoms are big business. Specifically the sales of underwear (and Lycra, more of which later). With M&S predicting a change in the shape of knickers, Mary Portas asks what this might mean for jeans (the mind boggles). As Mary concludes her investigation into Britain’s spending habits, she notes a move away from disposable fashion towards experiences. We now want more for our hard-earned cash, whether that’s getting on our bikes, going to a music festival or planning a wedding. Mary explores the rise of Mamils (middle-aged men in Lycra), the effect of festivals on high-street trends and the impact of social media on wedding planning