Coral say they have laid a £12,000 cash bet on the Henry Cecil-trained Twice Over at 12/1 to win the Derby to a customer in their Mayfair branch in Central London.

The customer also placed a £2,000 ante-post treble on Twice Over at 12/1 in the Derby, Kauto Star at 5/4 for the Gold Cup and Sublimity at 4/1 in the Champion Hurdle.

Coral reacted to the sizeable wager by cutting Twice Over to 8/1 from 12/1 for the Derby.

"The customer has placed a handful of bets before in this Coral branch but nothing of this magnitude," said Coral spokesman Simon Clare.

"We already had substantial liabilities on Twice Over for the Derby and this massive bet has forced us to slash his price and run for cover," added Clare.