19:50CoastSeries 4 (Shortened Versions)Episode 2: Norman ConquestBBC Two Duration: 8 minutes Thu 2nd Sep 2010, 19:50 on BBC Two Northern IrelandMark Horton discovers how William the Conqueror taught the English how to construct castles and why William looked to Normandy for the Tower of London's stone.ContributorsPresenter:Mark HortonExecutive Producer:William LyonsSeries Producer:Steve EvansonGenresFactualScience & NatureFactualScience & NatureNature & EnvironmentFormatsDocumentariesBrandCoastSeriesCoast: Series 4 (Shortened Versions) Source: BBC Online