A woman who bought a copy of Harry Potter in 1997 for just £3.50 has discovered that it is now worth a staggering amount nearly 30 years after she first purchased it.

Jane Thompson-Webb, now 54, bought an original soft cover first edition of Harry Potter and The Philosopher’s Stone when she was 26.

Originally costing £4.99, she was given a 30 percent staff discount to bring the price of the tome down to £3.50, the equivalent of around £10 today with inflation taken into account.

Now, 27…