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The National Lottery is seeking seven secret millionaires - one of them from north Dorset.
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 and, as the London 2012 Games draw to a close, the areas in which the missing millionaires bought their tickets can now be disclosed.
The ticketholders are from: the London Borough of Harrow; Bedford; Thurrock, Essex; north Dorset; the city of Newport; Wirral, Merseyside; and Hodge Hill, Birmingham.
The tickets are all worth £1 million and the ticketholders have until 11pm on January 23 to make their claim.
A National Lottery spokesman said: "We urge every player to check their tickets as they could be one of our missing millionaires. The clock is now ticking for these ticketholders and we want to be presenting them with their giant cheque so they can start enjoying their win as soon as possible.
"Check down the back of the sofa or in your coat pockets - the ticket could be lurking anywhere.
"This draw has already broken a world record and we hope to push it as high as possible."
Players have 180 days from the day of the draw to claim their prize if they have the winning ticket.
Anyone who believes they have the winning ticket for any of the National Lottery draws within the 180-day deadline should call the National Lottery Line on 0845 910 0000.