© licensed to London News Pictures. 14/06/2011. Ascot, UK.  HRH The Queen enters the winners circle on day one at Royal Ascot races today (14/03/2011). The 5 day showcase event,  one of the highlights of the racing calendar is in it's 300th year. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course. Photo credit should read: Ben Cawthra/LNP
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