Boat races and regattas are mainstays of the British summer - but where did these races originate and how have they become so important a part of our culture? Historian, writer and novice sculler Julie Summers here explains the history of British rowing as a competitive sport from the early nineteenth century to the present day. She then profiles the three most famous rowing events: the Boat Race, rowed on the incoming tide from Putney to Mortlake...