When Jarvis Cocker started clearing out his loft, he found a jumble of objects that catalogued his life. From a Gold Star polycotton shirt to a pack of Wrigley’s Extra, from his teenage attempts to write songs to the Sexy Laughs Fantastic Dirty Joke Book, this is Jarvis Cocker, Pulp, 20th-century pop culture, the good times and the mistakes he’d rather forget. And the accumulated debris of a lifetime reveals his creative process – writing and musicianship, performance and ambition, style and stagecraft. He talks to broadcaster, author and journalist Sarfraz Manzoor.