In this week's podcast Hugh Linehan and Laurence Mackin discuss the Edinburgh Festival with Peter Crawley and "How to keep an Alien" creater Sonya Kelly.

Later in the podcast they interview Tadhg O'Sullivan, director of the new documentary The Great Wall.

Off Topic is a weekly culture and ideas podcast. It is researched by Declan Conlon and produced by Sinead O'Shea.