16:00The 4 O'Clock ShowWW1 Tanks, Charles Darwin and Richard HammondBBC Radio 4 Extra Duration: 1 hour Wed 20th Aug 2014, 16:00 on BBC Radio 4 ExtraMel hears what it was like being trained to drive tanks in WW1, and we visit the home and garden of one of the world's greatest scientists, Charles Darwin.GenresEntertainmentBrandThe 4 O'Clock Show Source: BBC Online