The £33m sum is the biggest prize since the National Lottery was launched in November 1994
UK lottery operator Camelot has received a "valid claim" for a record £33m Lotto jackpot prize, it says.
The holder of the winning ticket - bought in Worcester for the 9 January draw - has opted to remain anonymous.
About £66m had been up for grabs to players, but it was the unclaimed £33,035,323 that had people checking their old tickets.
In the days since the winning numbers were announced, Camelot has been inundated with claims.