Liz Barclay introduces her selection of highlights from the past week on BBC radio. Programmes featured: Billy Liar 50 Years On - Radio 4 Great Lives: Tennyson - Radio 4 Searching For Alfred - Radio 3 M16: A Century in the Shadows - Radio 4 Cat on a Hot Tin Roof - Radio 2 Benjamin Jealous: The Future of the NAACP - Radio 4 The Election Agent - Radio 4 The Odd Half Hour - Radio 4 Between Ourselves - Radio 4 The Now Show - Radio 4 The Movie That Changed My Life - Radio 2 Very Amazing - Radio 4 The Long View - Radio 4 The Hidden World of Jacques Cousteau - Radio 4 Last Chance For Africa's Elephants - Radio 4 Muriel Spark: The Biography - Radio 4 Gesualdo: Musician and Murderer - Radio 4.