With Mark Lawson. Oscar-winning film-maker Steven Spielberg discusses his new adaptation of Michael Morpurgo's book War Horse. Andrew Collins reviews the audio version of cultural theorist Marshall McLuhan's most famous work. The Medium Is The Massage is a mash-up of musings, music and bizarre effects and is re-released 40 years after it first assailed the ears of the general public. Archie Burnett discusses his collection of Philip Larkin's complete poems, which is considerably larger than the slim volumes that the poet published in his lifetime. Mark Lawson finds out if he has unearthed any lost treasures. Producer Katie Langton.