Marketing Week claim that the latest figures from Camelot show that between July and October this year, Dream Number sales averaged £1.1 million a week.

This compares to an average of £1.3 million a week between January and March this year and £1.5 million a week between October and December 2006.

In one week during that quarter, sales hit £2 million.

On average, sales have slumped by about one-third.

Dream Number was launched in July 2006 to replace the underperforming Lotto Extra game.

All good cause funds from each £1 Dream Number ticket go to supporting the 2012 Games and the Paralympics.

A Camelot spokesman says the decline is down to fluctuating sales as people play different games according to the level of jackpot on offer.

He told Marketing Week that Camelot has so far raised over £200 milion for the Olympic Lottery Distribution Fund.

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