Tickets for the annual rock extravaganza at Bramham Park, near Wetherby, are going on sale on Monday, March 29.

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A number of professional-looking websites, however, are already claiming they have passes available for purchase.

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Private sellers on auction site eBay are also advertising multi-ticket deals for hundreds of pounds with 'Buy Now' tags.

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But event organiser Festival Republic says fans could end up getting ripped off should they decide to take the plunge early.

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A spokesman for the firm said: "If any sites are claiming to sell tickets, they are not an official agent and have not received them legitimately from us. Do not get scammed."

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Festival Republic managing director Melvin Benn fears some operators are planning to inflict a double whammy on fans.

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He believes touts who have been selling fake tickets online will also have teams in place outside Bramham Park.

They are expected to target people who have been turned away for having fakes and offer them replacement passes – which will then turn out to be bogus as well.

"The crooks are getting better," Mr Benn warned.

Prices for this year's festival have yet to be announced but last summer's weekend camping tickets cost £175 each.

The line-up for the 2010 bash is also due to be unveiled on March 29.
Acts being tipped to appear over the August Bank Holiday weekend include Arcade Fire, Blink 182, My Chemical Romance and Hole.

Bands which performed in 2009 included Arctic Monkeys, Radiohead, Kings of Leon and Leeds's own Kaiser Chiefs.