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."
Miss Carrington and Mr Topham, both 22 and from Stapleford, Nottingham, won £45,160,170.50 with a lucky dip ticket in the February 7 draw.
Husband and wife Gareth and Catherine Bull, from Mansfield, Nottinghamshire, won £40,627,241 in the January 20 draw.
Another UK ticket-holder became a millionaire in last night's EuroMillions draw by matching the Millionaire Raffle selection BFM 800968.