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22 June 2012, 06:40 | Updated: 22 June 2012, 12:07
It's been revealed the British winner of a £63m Euromillions prize bought their ticket in the Stevenage/Hitchin area of North Hertfordshire.
The ticket was bought for the draw on Friday 8 June 2012, and was one of two winning tickets that night. The other was bought in Belgium.
The UK winner has scooped £63,837,543.60. This is now the longest time such a big win has gone unclaimed.
According to lottery rules, the winner - who could be an individual or a syndicate - has 180 days to pick up the prize, meaning they must come forward before 11pm on 5 December 2012.
A Camelot spokesman said: "We're desperate to find this mystery ticket holder and unite them with their winnings and we're urging everyone to try checking in the pockets of clothing, in wallets, bags and down the back of the sofa - someone out there could literally be sitting on a fortune.
"We have the champagne on ice and our fingers crossed that the lucky winner comes forward to claim their win.''
If the ticket holder fails to come forward, the money - and the interest it has generated - would go to the National Lottery Good Causes fund.
The prize pot came as a result of a double rollover.
The winning numbers were 5, 11, 22, 34, 40 and the Lucky Star numbers were 9 and 11.
Camelot can make a pay-out, at its discretion, where a ticket has been lost, stolen or destroyed - but only if a claim is submitted within 30 days of the draw and if there is sufficient evidence.