The British EuroMillions ticketholder who has won Europe's biggest ever jackpot of £161 million has yet to come forward, Camelot has said.
The lucky UK player matched all five main numbers and both Lucky Stars to land the bumper prize in last night's draw. It is not yet known whether the overnight multi-millionaire is an individual or in a syndicate, or where they are from.
Tuesday's massive jackpot was capped after a series of rollovers made it the largest ever in the UK and Europe. The winning numbers were 17, 19, 38, 42 and 45, and the Lucky Stars were 9 and 10.
The exact amount to be claimed by the winner is £161,653,000 while two other UK-based lottery players won £1.7 million after matching five numbers and one Lucky Star.
A National Lottery spokesman said: "This is the biggest winner this country and Europe has ever seen, and follows hot on the heels of the anonymous ticket-holder who last October scooped £113 million.
"In addition, two UK ticket-holders in the next prize level down won £1.7 million for matching five main numbers and one Lucky Star. We've got the champagne on ice and look forward to welcoming the ticket-holders into the National Lottery millionaires' club."
Until Tuesday's draw, the largest lottery winner in the UK was an anonymous player who claimed £113 million in the EuroMillions in October last year. If the ticket is held by a single player, it will catapult them into 430th place in this year's Sunday Times Rich List.
A taxi driver who won £1 million in the EuroMillions Millionaire Raffle has said he plans to spend some of his windfall on a new seven-seater car.
Self-employed Cardiff cabbie Adam Derbi, 35, also hopes to buy a house. The father-of-five and his wife, Natalia, will celebrate by treating close family members to a slap-up meal at their favourite restaurant.
Mr Derbi, who was brought up in the Cardiff suburb of Ely, said: "A £1 million win is a colossal amount of money, but I have a big family and I am determined to be as practical and sensible as I can."