A claim has been staked for the £35.1 million Lotto jackpot, the biggest prize ever won in the game, operator Camelot said.
A single ticket-holder won the £35,133,888 jackpot in last night's draw.
A National Lottery spokesman said: "We're delighted this ticket-holder has come forward to claim their prize so they can now begin to enjoy their life changing win."
Camelot said the prize would be paid out at a ticket validation appointment, and the winner would then decide whether or not to go public and share their news.
There will be no information on whether it is an individual or syndicate winner or where the ticket was purchased unless the ticket-holder decides to go public.
The winning numbers in Wednesday night's draw were 50, 57, 31, 17, 41, 15 and the bonus number was 5. Set of balls one and draw machine Arthur were used.
It is the latest big win this year.
In January, two Lotto ticket holders broke a 21-year-old record, splitting a £66 million jackpot that was the result of 15 rollovers.
One of the winning tickets was claimed by David and Carol Martin, a couple living in the Scottish Borders. The other winner remained anonymous.
A few weeks later, Gerry and Lisa Cannings, from Deeping St James, near Peterborough in Cambridgeshire, snapped up £32.5 million.
The previous record was a jackpot of £22.5 million, claimed by two business partners from St Leonards-on-Sea in 1995.
In 1996, three winners shared a £44 million prize, taking home £14 million each.
Meanwhile, Saturday's estimated jackpot is £4.2 million.
Nobody matched five numbers plus the bonus ball, but 35 people matching five numbers won £1,914 each.
There were 2,769 winners who matched four balls and they will take home £156 each.
Matching three numbers each, 70,801 tickets scooped £25.
As well as the winner of the £1 million prize Millionaire Raffle, there were 20 additional ticketholders who scooped £20,000 each.
No-one won the top prize of £350,000 in the Lotto HotPicks draw.
In the Thunderball draw the winning numbers were 39, 23, 04, 20, 16 and the Thunderball number was 02.
No-one scooped the top prize of £500,000.