A National Lottery spokesman said:
This Bank Holiday has turned out to be truly memorable for one UK winner, not only will they enjoy the extra day off but they'll now also be banking a multi-million-pound cheque.
This single UK ticket-holder will enter the exclusive top 10 on The National Lottery rich list - at number eight - and we've got the champagne on ice ready for the lucky winner to claim their prize.
As well as offering a chance to win life-changing prizes, EuroMillions continues to help raise over £33 million every week for National Lottery-funded projects across the UK.
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Voting that had been expected on Thursday will now be held Friday instead.
Police were called in amid fears the man may have been poisioned.