Nine European countries participate in the EuroMillions lottery
The winning ticket holders of the UK's largest-ever lottery prize are a married couple from Newport, in south Wales, and a syndicate from Liverpool.
The two tickets will take a £45,570,835.50 share of Friday's £90m (100m euros) Euromillions jackpot.
The syndicate is a group of IT workers who are employed by Hewlett Packard.
The ticket holders' identities will be revealed at news conferences on Tuesday, when they are expected to outline their plans for their winnings.
Until now, the biggest single win was by Angela Kelly, from South Lanarkshire, who won more than £35m (39m euros) in August 2007.
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The winning numbers on Friday were 19, 43, 45, 34, 11 and the Lucky Star numbers were 5 and 9.
Nine European countries participate in the EuroMillions lottery - Britain, the Irish Republic, France, Spain, Portugal, Austria, Switzerland, Belgium and Luxembourg.
In May, a ticket bought in Spain broke the European lottery's record by netting a 126m euros (£110m) jackpot.
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