A claim has been made for the £121.3m EuroMillions jackpot which was won by a UK ticket holder in Tuesday's draw, Camelot says.
The lucky winner will be the third biggest lottery winner in UK history.
The National Lottery operator said 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.
Andy Carter, senior winners' adviser at The National Lottery, said: "What a win. This ticket-holder has flown into third place on the National Lottery Rich List and can now afford to fly away anywhere they like.
"We will now look to support the winner as they take the first steps to enjoy this incredible win."
With the numbers 20, 23, 28, 30 and 44, and the lucky stars 03 and 07, they will join a tiny handful of individuals to have taken home more than £100m in a Lotto draw.
The winner's new-found fortune means they may now be able to consider investing in some of the UK's most sought after properties, cars or luxury goods many times over.
If housing is what they're interested in, pads in Kensington Palace Gardens, the country's priciest street, average about £35m, while apartments at One Hyde Park are approximately £75m.
Designer dresses are an option for loose change: some of the outfits seen on the red carpet can cost £100,000, and Kate Middleton's wedding dress was about £250,000.
Potential art collectors might be interested in purchasing the kind of iconic works that fetch double or triple million figures.
Andy Warhol's Marilyn sold for £57m, while one of Pablo Picasso's most expensive paintings, Le Reve, went for about £113m in 2013.
Some ways to spend the money may be less popular: £120m was the projected cost of a royal yacht suggested by 50 Conservative MPs - to be funded by a Lotto type game.
The lucky winner may not want to drop their new found cash on luxury goods however.
Previous top-level lotto winners Colin and Chris Weir have opted to give much of their £161m fortune, won in 2011, to charitable and political causes, giving generously to the SNP and Scottish national heritage projects.
Their Weir charitable trust supports community groups and small charities across Scotland and gives out awards that average £3,500.