"On Sunday evening, Ticketmaster experienced a technical error that inadvertently caused an e-mail to go out ahead of schedule to people who had signed up for Inaugural ticketing information with an invitation to purchase public tickets for The Inaugural Ball and the Inaugural Parade, " the spokesperson said.

CNN: STORY HIGHLIGHTS

From early next year, a Made in UK logo will start appearing on ticketing and online product information to highlight British-made products.

BBC: Buy British: Why isn't there a new campaign?

The two million people already signed up to the London 2012 ticketing database will receive information about how to apply, with registered users being able to use their existing log-in details.

BBC: London 2012 Olympic tickets on sale 15 March