A couple who claimed the massive £148.6 million EuroMillions jackpot are expected to tell of their plans for the future as they celebrate their win.
It was revealed on Monday that the pair were from the town of Haverhill in Suffolk, but their identity has been kept a closely guarded secret.
They are due to go public when they accept their super-sized cheque, which will make them the nation's second richest lottery winners.
The staggering sum - of £148,656,000 - is just behind the £161 million landed by Colin and Chris Weir, from Largs in North Ayrshire, last July.
A difference in the exchange rate means this week's jackpot was slightly lower.
The couple were the only winners in Friday's draw.
A National Lottery spokesman said: "A couple from Haverhill, Suffolk, have won the UK's second biggest ever lottery prize. They were the only winners in Friday's EuroMillions draw and have banked an amazing £148,656,000."
Theirs is the seventh lucky ticket to have hit the jackpot in the UK this year.
To date, the National Lottery has created some 2,900 millionaires.
Friday's winning numbers were 50, 21, 17, 48 and 11, and the Lucky Star numbers were 09 and 10.