It's screenwriter Frank Cottrell Boyce's talk The Joy of Failure on Radio 3's Night Waves. His thesis is that failure is not something to be fearful of, rather that progress (and Post-It Notes) depend on mistakes.
"Is this pathology-ward level cheering and waving really encouragement? Or is it a strange new morbid dread of failure? Boyce ... makes a passionate plea for the traditional enemies of happiness - error, disappointment and, above all, failure. Bad ideas have often led to great discoveries, he claims, and human knowledge is dependent on our ability to continue making mistakes."