Julia Grinham, CEO and co-founder of design-your-own-shoe site Upper Street, talks Kirsty Styles through the success of its iPad app, which accounts for 40 per cent of its total traffic; why it opted for tablet over smartphone; and what the role of a bricks-and-mortar store is for an online retailer.
You can listen to the interview below, or download it as a podcast here. 
