A builder who stockpiled lottery tickets in his van discovered he had won £76 million on the EuroMillions six weeks after the winning draw.
Andrew Clark, 51, from Boston, Lincolnshire, said he was taking early retirement after discovering the winning ticket tucked in the visor of his Peugeot Expert van.
He made a claim for the prize - the 12th biggest win ever in the UK - last week, Camelot said.
Mr Clark, who was urged to check his stash by his partner, said:
The ticket was bought from Eastwood Road Post Office in Boston.
Self-employed Mr Clark revealed himself as the winner at a press conference in Grantham on Friday morning.
Referring to himself as "the man who nearly lost £76 million", he said he realised he was the mystery winner after he "finally gave in" and began working his way through his stash of tickets one evening.
He and his partner, Trisha Fairhurst, 51, have already bought a new home and two cars but say "the best thing about the win is how we can help all our family".
The grandfather-of-three said: