It is the third largest jackpot to be won in the UK.
Subject to ticket validation, the winner's bank account will be £101,203,600.70
better off on Monday morning.
A National Lottery spokeswoman said: "This is amazing news, we are absolutely delighted."
The biggest-ever EuroMillions prize was a £161m jackpot won by Colin and Chris Weir, from Largs, Scotland, earlier this year.
The spokeswoman added: "This is the third biggest winner this country has ever seen and follows hot on the heels of the Weirs who banked an incredible £161m in July.
"We've got the champagne on ice and look forward to welcoming the ticket-holder into the National Lottery millionaires' club."
It is not yet known if the prize has gone to a single ticket-holder or a syndicate.
An individual winner would become £1m richer than rock'n'roll legend David Bowie, the 703rd richest person in the country, according to The Sunday Times Rich List 2011.
They would move ahead of celebrity couples such as Sharon and Ozzy Osbourne (£95m), and Gwyneth Paltrow and Chris Martin (£48m).
The winning numbers were 18, 26, 34, 38, 42. The Lucky Star numbers were 8 and 5.