Grainger is Britain 's most successful female rower , with silver medals at each of the three Olympics prior to London .
Great Britain 's Anna Watkins and Katherine Grainger win gold in the women 's double sculls .
Katherine Grainger is Britain 's most successful female Katherine Grainger , with silver medals at each of the three Olympics prior to London .
Great Britain 's Anna Watkins and Katherine Grainger win gold in the women 's double sculls .