Ernie Rea introduces his selection of highlights from the past week on BBC radio. Jon Ronson On... Ambition - Radio 4 Stefan Gates' Cover Story - Radio 4 Henry Moore, My Father - Radio 4 The Right Ingredients - Radio 4 Nature - Radio 4 Robo Wars - Radio 4 Today - Radio 4 Sunday Feature: Songs of Trebizond - Radio 4 Elvis Trail - Radio 2 Listening to China - Radio 4 Joan Armatrading on Bob Harris - Radio 2 The Ditch - Radio 4 First Nation, First People - Radio 4 Mark Thomas: The Manifesto - Radio 4 Stephen Nolan Show - Five Live.