Footballer Mark Walters is remembered for his wing wizardry, but while he’s revered by the Rangers faithful who cheered him for four trophy-laden years, he also endured racist chants – an issue he campaigns against now. At the Edinburgh International Book Festival 2019 Walters talks to Pat Nevin about new memoir Wingin’ It, working for Graeme Souness, great moments at Liverpool and Aston Villa, and his views about the modern game.