The National Lottery Commission has disputed claims that its ticket sales have increased since the new Health Lottery started.
Martin Hall, chief executive of the Health Lottery, said last week: "We know from recent data that sales in the National Lottery are in fact £50,000 higher per draw since the launch of the Health Lottery."
Hall claimed his lottery had "driven sales for the market leader" and "refreshed consumer interest".
But a spokeswoman for the commission, which regulates the National Lottery, said data on ticket sales for the period since the rival lottery began were not available yet.
She said the commission and Camelot, the lottery operator, had agreed statistics would not be published until 12 December.
"Considering that the Health Lottery has only been on sale for three weeks, it is too early for us to say what the impact on the National Lottery might be," the spokeswoman said.
"We are also in conversation on a daily basis with our retailers, who confirm they have seen nothing but a positive impact on overall category sales, suggesting that all of the £2.4m raised to date is additional good cause money," he said.
The chief executives body Acevo yesterday urged supermarkets and retailers to stop selling Health Lottery tickets because "it would mean less money going to good causes".
The National Lottery awards 28p in the pound to good causes. The Health Lottery awards 20p in the pound.