Racegoers are preparing for Gold Cup Day, also known as Ladies' Day, one of the highlights at Royal Ascot.
Ladies' Day is known for its display of flamboyant and exotic hats and the most extravagant creations.
Racegoers also traditionally bet on the colour of the hat the Queen will wear on the day.
Bookmakers Coral believe she will wear a blue hat and makes the colour its 3-1 favourite.
However, punters have been backing purple and its odds have fallen from 8-1 to 5-1.
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Ms Rayner and the Labour leader will visit Blackpool on Tuesday to outline their proposals.