Lottery players will have their fingers crossed as they buy their tickets for the first ever quadruple rollover.
No-one scooped Wednesday night's jackpot so Saturday's top prize will be a bumper £19.3m.
A National Lottery spokeswoman said: "This is the first ever quadruple rollover and a massive milestone for The National Lottery and its millions of players across the UK. Everyone will be crossing their fingers and planning what they would do if they land the bumper jackpot prize which must be won on Saturday."
She continued: "Whatever happens, whenever there is a big jackpot like this, the whole nation comes out as a winner - as more people playing means more money raised for the National Lottery Good Causes."
The winning numbers for Wednesday's draw were 40, 8, 6, 39, 43 and 11, and the bonus number was 22, Camelot said.
Set of balls six and draw machine Lancelot were used.
Four ticketholders matched five numbers plus the bonus to take home £250,484, while 357 won £1,754 for five numbers.
A total of 18,486 matched four numbers to claim £74 each, while 360,655 won £10 for matching three numbers.
Nobody won the top prize of £130,000 in the Lotto HotPicks draw.
In the Thunderball draw, the winning numbers were 2, 14, 21, 3 and 37, and the Thunderball number was 9. No one won the £500,000 top prize.
Tax tricks to improve your wealth
Quadruple rollover a lottery first
If you wear a uniform of any kind to work and have to wash, repair or replace it yourself, you may be able to reclaim tax paid over the last four years. For some people, this could mean a windfall worth hundreds of pounds
The interest you receive on savings accounts (with the exception of cash Isas) is automatically taxed at a rate of 20%.
Higher-rate taxpayers therefore tend to owe money on the interest they are paid throughout the year. If, however, you are on a low income or not earning at all, you should be able to claim all or some of the tax deducted back
You can apply for a refund of vehicle tax if you are the current registered keeper or were the last registered keeper of your vehicle that no longer needs a tax disc
If you pay tax on a company, personal or State Pension through PAYE (the system employers use to deduct tax from your wages), you may well end up overpaying
There is a limit to the amount you need to pay in NI, whether or not you work for an employer.
Instances in which you may find that you have overpaid include if you work two or more jobs and earn more than £817 a week and if you move from self-employment to employment, but continue to pay Class 2 National Insurance contributions