Queen's horse Estimate fails drugs test

A racehorse owned by the Queen has tested positive for morphine, a prohibited substance, Buckingham Palace announced.

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Estimate's Gold Cup win helped Queen make history

Estimate, the racehorse which has tested positive for a banned substance, helped make sporting history for the Queen as she became the first reigning monarch to win Royal Ascot's Gold Cup.

The Queen receives a trophy after Estimate's win in the Gold Cup. Credit: PA Wire

The Queen was pictured beaming as Estimate crossed the line in first place during the dramatic race last year.

Prime Minister David Cameron congratulated the Queen in a tweet saying: ''Huge congratulations to Her Majesty for Estimate's victory at Royal Ascot - first time ever a reigning monarch's horse has won the Gold Cup.''

Her Majesty won £155,960 in prize money after Estimate's victory.

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