Princes William and Harry's old school, Eton College, has said it "deeply regrets" a mistake which left hundreds of would-be pupils thinking they had been given a place.
A computer glitch at the public school that has produced more prime ministers - including David Cameron - than any other, meant an email intended for nine families with a conditional offer was sent out to 400 households.
The glitch meant all the boys were offered a conditional place after an interview to join the September 2017 intake as long as they passed the Common Entrance exam.
The Berkshire boarding school, also attended by London mayor Boris Johnson, said it will hold an internal review.
An Eton College spokesman said: "This error was discovered within minutes and each family was immediately contacted to notify them that it should be disregarded and to apologies.
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