A lucky UK ticket-holder who won £46.4 million on the EuroMillions draw may have been identified, Camelot said.
Just one ticket matched all seven numbers to take the jackpot prize of £46,432,285.20.
The winning numbers were 03, 07, 12, 26 and 34 and the lucky stars were 08 and 10.
A National Lottery spokeswoman said a claim had been staked for the jackpot prize and, subject to validation, it could be paid out when the banks open on Monday.
She said: "It's unbelievable that we have had a third huge EuroMillions win here in the UK.
"Only a few weeks ago Cassey Carrington and Matt Topham won £45 million and last month Gareth and Catherine Bull won £40 million, so the UK is clearly enjoying a run of amazing luck.
"We have plenty of champagne on ice and look forward to welcoming the lucky ticket-holder into The National Lottery millionaires' club.
"Over 2,800 people have become millionaires since The National Lottery began and, to date, our players have raised an amazing £27 billion and counting for National Lottery Good Causes."
Carrington and Topham, both 22 and from Stapleford, Nottingham, won £45,160,170.50 with a lucky dip ticket in the 7 February draw.
They said top of their shopping list was a new computer and washing machine as their old ones had broken within minutes of each other on the morning of the draw.
Husband and wife Gareth and Catherine Bull, from Mansfield, Nottinghamshire, won £40,627,241 in the 20 January draw.
Bull, 40, said he bought his lucky dip ticket on a whim when he could not start a building job because of the wet weather.
The couple said they planned to take their two sons to Disneyland, Florida, but the most pressing matter on 35-year-old Mrs Bull's mind was a new landing carpet as she said their current one was "terrible".
Another UK ticket-holder became a millionaire in last night's EuroMillions draw by matching the Millionaire Raffle selection BFM 800968.
The winner, when announced, will join the top ten UK lottery winners ever - see below for the current list.