Question: who was the first woman to win who wants to be a millionaire?
Answer: Judith Cynthia Aline Keppel

Judith Cynthia Aline Keppel (born 18 August 1942) was the first one-million-pound winner on the television game show Who Wants to Be a Millionaire?  in the United Kingdom. She is also the only woman in the United Kingdom to have won it and also the first person to win a million pounds or more on a British television game show. She has appeared on the BBC Two quiz show Eggheads since 2003.