racing fans dressed in their finest outfits have arrived for ladies ' day at the aintree racecourse in liverpool .
the event is one of the most hotly anticipated of the racing calendar in what is a.p mccoy 's final festival .
45,000 spectators are believed to have arrived through the gates at aintree for the day 's racing .
sam twiston-davies rode saphir du rheu to win the betfred mildmay novices ' chase with ease .
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