Assuming you've had your fill of Nik Kershaw and Dermot Morgan's sons over on RTE 1 (The Saturday Night Show, 9.45pm), David Walliams talks about his autobiography Camp David, in which the Britain's Got Talent judge admits to seeking medical help for depression shortly before filming began on his breakthrough programme Little Britain. The host also catches up with Ed Sheeran, who took part in the Olympics Closing Ceremony in the summer, and the singer-songwriter performs live in the studio.