A £167 million EuroMillions jackpot could make a single ticket holder the UK's biggest ever lottery winner on Friday.
The EuroMillions pot reached its maximum of 190 million euro (£167 million) for the most recent draw on Tuesday.
Once it reaches this level, and if it is not won, it will stay at this amount for a further four draws until it has to be won in the fifth draw.
The current record holders for the biggest ever lottery win are Colin and Chris Weir, from Largs in North Ayrshire, Scotland, who won £161 million in 2011.
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Adrian and Gillian Bayford, from Suffolk, took home more than £148 million in August 2012.
The peak jackpot also means players matching the five main numbers and one Lucky Star can also expect bigger prizes.
One UK player won £3.6 million in Tuesday's draw for matching the five main numbers and one Lucky Star number.
The National Lottery said it had a team of advisers on standby to help a winner.
Andy Carter, from the National Lottery, said: "We don't tell you what to do with your win as we are not financial or legal experts, although we do make sure you have access to this advice, but we are experts in winning the National Lottery.
"The team here have met thousands of millionaires and paid out billions of pounds in prizes so our tips are based on years of experience."
He advised any winner to "do nothing" before taking advice.
He said: "Take your time and maybe think about getting away for a few days. Let it sink in before making any big decisions for how life is going to change.
"Past that, our advice would be to listen to the experts that we can put you in touch with. We can potentially even set up a meeting with another winner over a cuppa, after all if anyone knows what you're going through it's going to be another lottery winner."
In June, one anonymous ticket holder became the UK's third biggest ever winner after scooping a £123 million jackpot.
Patrick and Frances Connolly from Northern Ireland won £114.9 million on New Year's Day, Ade Goodchild banked £71 million in March and another anonymous player won £38 million in April.