The National Lottery is searching for a ticket holder in Colchester in Essex who is yet to claim their £8 million prize.
An event is being held in the town centre on Tuesday urging people to check their tickets.
If you have lost your ticket, there is a crucial 30-day period when you can still claim your prize in writing. That deadline runs out on Friday 14 October.
However, if the ticket is produced, the winner has until March 2017 to claim.
The draw was made on 14 September and the prize money of £8,168,679 came from matching five balls and the bonus ball.
The winning lottery numbers were: 16, 23, 35, 42, 44, 58 and the bonus ball was 28.
We're just hours away from finding out who's won the biggest ever Lotto jackpot. Nearly £60m is up for grabs in tonight's big rollover. Although the odds suggest you're more likely to be struck by lightning than match 6 numbers, lots of people were out and about buying last-minute tickets today.
To see what some people in Northamptonshire are planning to spend their potential winnings on, watch Sarah Cooper's report below:
A woman from Haverhill who won 148 million pounds on the Euromillions lottery has given her first television interview.
Speaking exclusively to ITV News Anglia, Gillian Bayford told us about life as a multi-millionaire and why she's decided to invest in a children's play centre.
A woman from Haverhill in Suffolk, who won 148 million pounds on the Euromillions lottery, is using some of her winnings to refurbish a children's play centre in the town, which had closed down.
Gillian Bayford and her husband won their millions last August. Gillian says it's important to give something back to the local community. You can see her story in full on ITV News Anglia tonight at 6pm.
A Lotto jackpot prize of £3,017,471 has yet to be claimed in the Tendring District. The ticket was bought in the Tendring District, who matched all six numbers ahead of the Lotto draw on Saturday 2 February 2013.
The winning Lotto numbers on that date were 2, 12, 13, 14, 21, 30 and the bonus ball was 39. The winner has until August 1 2013.
The National Lottery is seeking seven millionaires - one of them from Bedford.
Each won £1 million in the EuroMillions Millionaire Raffle on the opening night of the Olympic Games, which broke the world record for millionaires made in one draw.
So far 93 winners have claimed their money but the owner of one winning ticket bought in Bedford still hasn't come forward. The winner has 180 days to claim their prize.
The ticket for an unclaimed £63.8 million EuroMillions jackpot was bought from a shop in the Stevenage and Hitchin area, the National Lottery has revealed.
The prize won by a UK ticket holder remains unclaimed nearly a fortnight after the draw.
There were two jackpot winners in the June 8 draw - one in Belgium and one in the UK. But the owner of the British lucky ticket - who could be an individual or a syndicate - is yet to come forward to collect their £63,837,543.60 prize.
If you want to check your ticket here are the lucky numbers:
5 11 22 34 40 with the bonus numbers 9 and 11