The Queen made a secret trip to visit her horses after her last minute withdrawal from the first day of the Royal Windsor Show, it has been revealed. Thursday marks the first time the Queen has missed the Royal Windsor Show in 79 years.The annual show is a four day event which features competitions in three equestrian disciplines. It is the UK's largest outdoor horse show.The Queen was due to be driven from her private apartment in the Windsor Castle to the event, in order to watch one of her horses compete.