Angela Kelly, of East Kilbride, South Lanarkshire, England, is the largest individual prize winner in Engalnd's lottery history. She won the £35.4m EuroMillions jackpot on Friday, August 10, 2007, but was not aware of her win until Monday.
EuroMillions is played in the UK, Austria, Belgium, Ireland, Portugal, France, Luxembourg, Spain and Switzerland.
The lucky dip ticket was in her handbag and she only checked it when she realized the prize was yet to be claimed. Angela, who lives with her 14-year-old son, said she would quit her job at a Glasgow sorting office.
Angela, a transport manager, earns £21,000 annually. It would have taken her about 1,500 years to earn the amount of her win.
She said she was still deciding how to spend her winnings. "I feel totally in limbo. I just need to sit down to get my thoughts together," Angela said.
"My son does not want to move out of the flat and I don't want to move too far away because he is going into fourth year at school."
During a media conference at Airth Castle near Falkirk, Angela described how she had bought the ticket in Sainsbury's on Thursday but forgot to check the numbers the following day.
She said she was out with girlfriends on Saturday and spent Sunday sitting in front of the TV.
It was only on a break from work on Monday that she remembered to check her ticket. She asked five colleagues to check that she had won because she could not believe it.
"I couldn't even say anything, I just pushed my chair back and put my head between my knees, I was so flabbergasted," Angela said.