The EuroMillions jackpot will hit an estimated £166 million after no lucky winner emerged in the latest draw.
The prize money, which would create the biggest winner in Europe if a single ticketholder scooped the lot, will now roll over to Friday's contest.
A National Lottery spokesman said: "This Friday's EuroMillions jackpot is now a staggering £166 million."
No one matched all five main numbers and two Lucky Star numbers to win the jackpot on Tuesday night.
The current biggest lottery winner in the UK is an anonymous ticketholder who scooped a £113 million prize last October.
On August 22, 2009, a single ticket won Italy's SuperEnalotto jackpot, which stood at 147,807,299.08 euros (£128.3 million at the time).
The EuroMillions jackpot can grow to a maximum of 185 million euros - about £166 million.
If no one wins it this Friday, it will be frozen until a lucky player matches all five main numbers and two Lucky Star numbers to win.
Any prize money which would have boosted the jackpot above that level is passed down to the next prize-winning level in each draw boosting the prizes to those winners, Camelot said.
The winner would be the equivalent of 418th on the Sunday Times Rich List.