Is it YOU? Check down the back of the sofa: Lottery winner has just two days left to claim £64 million prize

The winner, who looks set to miss out on £63,837,543.60, has just two days to hand in their ticket and claim the money

The lucky winner has until 11pm on Wednesday to cash in the ticket which was bought in the Stevenage and Hitchin area of Hertfordshire for the EuroMillions draw on Friday June 8. (Getty)

Time is running out for a mystery potential multi-millionaire who faces losing the biggest unclaimed prize in the lottery's history.

The winner, who looks set to miss out on £63,837,543.60, has just two days to hand in their ticket and claim the money.

The lucky winner has until 11pm on Wednesday to cash in the ticket which was bought in the Stevenage and Hitchin area of Hertfordshire for the EuroMillions draw on Friday June 8.

The all-important numbers on that date were 5, 11, 22, 34 and 40, and the Lucky Star numbers were 9 and 11.

The missing ticket-holder matched all five main numbers and both Lucky Star numbers.

Daily interest has continued to accrue on the prize meaning they could claim up to £700,000 on top their total.

The record for the biggest unclaimed total so far is £9million in Doncaster in the mid 90s, and some winners have narrowly escaped missing out on their prize, claiming it on the final allowed day.

The National Lottery has appealed for all lottery players to check their tickets and perhaps even search some of the more unusual places where "lost" tickets have been found in the past.

If the money is not claimed it will go, along with all the interest it has generated, to the National Lottery Good Causes - adding to the £29 billion already raised through sales of lottery tickets since the National Lottery launched in 1994.