The lucky ticket holder who has scooped the UK's biggest-ever lottery prize of £56 million has not yet come forward to claim the mega prize, a National Lottery spokesman said today.
Last night's EuroMillions win surpassed the £91 million paid out in November last year which was shared between two UK tickets.
The winning ticket shares the overall jackpot of £113 million with one other which was bought in Spain.
If the ticket belongs to an individual rather than a syndicate it will be the biggest lottery jackpot prize ever paid out to a person in the UK, the spokesman said.
The prize would also mean the winner would immediately become the 980th richest person in the country, according to the Sunday Times Rich List 2009.
Based on figures released when the list was published last April, they would be wealthier than Oasis stars Noel and Liam Gallagher (£52m), film director Guy Ritchie (£50m) and actor Sir Michael Caine (£45m).
A National Lottery spokesman said: "This is fantastic news - we're absolutely delighted to have such a massive UK win, which shared (last night's) mega jackpot with a player in Spain.
"This is the biggest win since Les and Sam Scadding and the Magnificent Seven syndicate each won £45.5m in November 2009.
"Subject to validation the prize could be paid out when the banks are open on Monday."
The lucky numbers are - 05, 45, 01, 38 and 18. The Lucky Star numbers are 6 and 4 and another UK millionaire won the Raffle Selection matching ZHR 111871Reuse content