The Museum of London. Image Wikimedia Commons
 
London before London: London 450,000BC to AD50. This exhibition at the Museum of London, “…explores the story of the Thames Valley and the people who lived here from 450,000BC to the founding of Londinium in AD50. 
“The London before London gallery spans some 450,000 years, from the arrival of the first people until the Roman invasion. Here you can discover more about many of the fascinating objects and sites in the exhibition.”
  
More here –
http://www.museumoflondon.org.uk/English/Collections/Prehistoric1700/Prehistoric.htm and thanks to nix on The Modern Antiquarian for drawing our attention to this exhibition.