Lottery organisers took to the streets as they stepped up the hunt for a mystery millionaire.
The unclaimed £63.8 million EuroMillions prize has been narrowed down to a ticket bought in Hertfordshire.
Its holder has still to come forward to accept the prize, nearly a fortnight after the draw - the longest such a large win has gone unclaimed.
Today shoppers in the Market Square, Hitchin, were greeted by two giant billboards, mounted on trucks, reading "Are you the lucky £63.8 million winner?".
According to lottery rules, the winner - who could be an individual or a syndicate - has a 180-day deadline to pick up the prize, meaning they must come forward before 11pm on 5 December.
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 winning numbers, just in case, were 5, 11, 22, 34 and 40 with the lucky stars 9 and 11.
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