Joanna Lumley travels to California to spend four days with the Black Eyed Peas founder, who has become equally famous in Britain as a coach on The Voice UK. Over dinner with his family, Joanna bonds with his mother, who tells her about Will's childhood, and how he made it out of his tough neighbourhood to become a global superstar. The singer also takes Joanna to some of his old haunts, and reveals why he is eager to use his own good fortune to help others