One UK ticket-holder has won the £170million EuroMillions jackpot to become the country's biggest ever winner.
Desperate ticket buyers had earlier forced the Lottery website to crash as punters flooded the page.
The player matched all five main numbers - 07, 10, 15, 44, 49 - and the two lucky stars - 03, 12 - in Tuesday's draw following the longest-ever series of rollovers.
Andy Carter, senior winners' adviser at The National Lottery, said: "One incredibly lucky ticket-holder has scooped tonight's enormous £170million EuroMillions jackpot.
"They are now the UK's biggest ever winner.
"Players all across the country are urged to check their tickets as soon as possible.
"It's been a fantastic year for UK EuroMillions players, with an amazing five jackpot wins.
"In June, one lucky ticket-holder, who chose to remain anonymous, became one of the UK's biggest ever winners after scooping a £123 million jackpot.
"As always, the team are on hand to support and help guide the new winner as they start their adventure with their life-changing win."
The £123 million winner in June has never revealed their identity and Camelot, which runs the National Lottery and EuroMillions, would not say whether it was an individual winner or a syndicate.
The previous biggest UK winners were Colin and Chris Weir, from Largs in North Ayrshire, who won £161million in July 2011.
Adrian and Gillian Bayford, from Suffolk, took home more than £148million in August 2012.
It has been a particularly successful year for Brits in the EuroMillions, with several jackpots claimed.
In the New Year's Day draw, Patrick and Frances Connolly, from Northern Ireland, won the £114.9million EuroMillions jackpot.
Ade Goodchild landed a £71million prize in March, while another anonymous ticket-holder bagged £35.2million in April.
Meanwhile, another Brit won £1million in the Millionaire Maker Selection game on Tuesday.
The Thunderball numbers were 13, 11, 26, 12, 29 and the Thunderball itself was 10, but no-one won the top prize of £500,000.
