The Queen 's horse Estimate wins the Cartier Stayer Award after a stellar year . Image caption Estimate, who won in 2015, is now being trained by Sir Michael Stoute's son Her Majesty is a keen horse racing enthusiast just like her mother and father . Prix de l'Arc de Triomphe winner Treve takes the Horse of the Year gong .
The Queen 's horse Estimate wins the Cartier Stayer Award after a stellar year . The four-year-old filly won the 2013 Gold Cup at Royal Ascot in front of the Queen . Her Majesty is a keen horse racing enthusiast just like her mother and father . Prix de l'Arc de Triomphe winner Treve takes the Horse of the Year gong .