Nicholas Crane's latest series:
http://www.bbc.co.uk/iplayer/episode/b0078sn5/Map_Man_Series_1_William_Smiths_Geological_Map_of_England_and_Wales/
Mike
http://www.bbc.co.uk/iplayer/episode/b0078sn5/Map_Man_Series_1_William_Smiths_Geological_Map_of_England_and_Wales/
Mike