As the final ball, number 37, rolled out of the lotto machine and Susan Boyle blasted out a version of Abba’s “the winner takes it all”, Dianne Thompson knew she was about to make another person in Britain extremely happy.
Saturday's National Lottery draw had an estimated jackpot of £4m, by no means a record but a sum that could still potentially add another strike to the number of millionaires Thompson has seen created in the 12 years she has presided over National Lottery operator Camelot.
Last year alone, the National Lottery turned 288 Britons into millionaires, the equivalent of one person every 30 hours, after it racked up record sales of £6.5bn.
Forthcoming half-year results are expected to show further "impressive"
progress in persuading Britons to gamble a few hard-earned pounds on the
dream of winning a fortune.
[Related link: Play the National Lottery online]
Thompson has been in the business of making dreams come true since 1997, when she joined Camelot as commercial operations director before being promoted to chief executive three years later. But recently, her work has brought her into slightly unhappier territory.
Since February, Camelot has been waging a bitter war against Richard Desmond after his Northern & Shell group, the parent company of Channel 5 and the Daily Express, last year stepped into what had previously been Camelot's exclusive territory by launching a rival, the Health Lottery.
The Health Lottery is structured as 51 local society lotteries managed under a single umbrella. This intricate structure means Desmond's lotto, which raises money for charities including Dementia UK and the Alzheimer's Society, avoids coming into conflict with legislation that dates back to 1993 when John Major's Conservative Government decided Britain should join other countries in having a National Lottery.
The battle against Desmond took Camelot to the courts at the start of the year after it sought a judicial review of the Gambling Commission's decision to grant the Health Lottery a licence.
That particular strike ended in defeat in August when the High Court rejected Camelot's application.
Despite initially threatening to seek an appeal, Camelot has now decided to take the war to a different front: Parliament.
No sooner had Hugh Robertson been handed responsibility for gambling in Prime Minister David Cameron's latest reshuffle than Camelot was knocking at the door of the Department for Culture, Media and Sport to argue its case against the Health Lottery.
Thompson has also written to the Prime Minister asking him to intervene and close a "loophole" in the 2005 Gambling Act that allows the Healthy Lottery to compete with the National Lottery.
Camelot's "loophole" interpretation is contested by Northern & Shell, which describes its structure as an "innovation" that is fully compliant with the 2005 Act.
But for Thompson, the legislation under which the National Lottery was created almost two decades ago is black and white.
"The 1993 Lottery Act made it quite clear there would be one National Lottery," she said. Camelot, owned since 2010 by the Ontario Teachers Pension Fund, is now on its third licence to run the National Lottery, which runs until 2023.
But Thompson is trying to impress upon ministers that the row over the Healthy Lottery needs urgent attention before others follow Desmond's lead. Last month, the Health Lottery also upped the ante by introducing a second draw, mid-week.
"I'm not worried about the Health Lottery per se, I know Richard Desmond and all credit to him, he has found a loophole in the law and has exploited it very well," Thompson says. "The bigger issue is the precedent it sets, you could well see a broadcaster, a major supermarket chain, any big organisation could come into this space. That's what the bigger worry is:you could have Tesco and Sainsbury's, for example, doing their own lotteries."
So far there is no evidence that a large company on the scale of a Tesco is seeking to enter the lottery market. But Camelot says it is aware of smaller organisations wanting to set up in competition.
Camelot says its research shows that in the first seven months following the Health Lottery's launch in October 2011, 62pc of its rival's sales were "cannibalised" from the National Lottery. Assuming that trend continued, Camelot may have lost some £73m to the Health Lottery in its first year, based on its rival's ticket sales of £119m.
The Healthy Lottery contests Camelot's figures, citing a report produced for DCMS, which says the weekly impact on National Lottery sales is in a range that "extends from being so low as to be immaterial to around £300,000".
Camelot's profit margin is capped at below 1pc so the effect, whichever organisation you choose to believe, on profits is limited. But Thompson argues the real loser is the taxpayer, which takes 12pc of the National Lottery's sales in duty. The lottery duty doesn't apply to society lotteries and the Health Lottery.
Says Thompson: "We are not the losers in this, the nation is the loser." Camelot is calling on the Government to make its position on competition clear.
"If they decide that actually in the spirit of competition they are happy for there to be lots of national lotteries, understanding they will lose significant amounts of money, then I can't do much about that," Thompson says. "I just want them to be awake to what could happen."
Legally, the Lottery boss admits there's very little Camelot can do if the Government does allow competition to stand. But she does admit it would raise questions about whether it would be worth bidding for a fourth licence in 2020.
"I don't know the answer to this, it's only hypothetical at the moment but when it comes to bid for the fourth licence, the question would be would you actually bid? A bid for the lottery here in the UK typically takes about two years and costs about £20m. So it's quite a heavy investment in time and resource."
That decision, if it comes, is unlikely to be taken by Thompson, who turns 62 next month and has only committed to stay on at Camelot until 2015.
But it's clear that before she does stop "serving the nation's dreams", as the Camelot slogan goes, Ms Thompson has a few battles left to fight.