Christine McCulloch made the purchase after watching JK Rowling being interviewed about her new novel on the BBC children's show Blue Peter in 1997.
A Harry Potter first edition book bought for a tenner nearly 30 years ago could now sell at auction for £50,000.
Owner Adam McCulloch, 35, a musician and marketing manager from Tansley, Matlock, Derbyshire, said: "Mum liked Blue Peter as a child and used to watch the show with us. I was seven, just about to turn eight, when we purchased the book on our family holiday with my dad to Stratford. "I don't know if it's because I spent so much time reading it as a child, but it's odd to know that out of all of the books I read, this one could spark such interest. But then I think back to how I raced through the book - I was the perfect age to be transported by it - and the buzz and clamour for the next stories in the series, queueing to get a copy so I could find out what happened before somebody at school gave away the ending.
"I might even put some wizard robes on for the occasion! A big part of my reason for selling is because the funds will allow me to spend more quality time with my partner, Jen, and my family.
BBC JK Rowling Books And Literature
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