The one-of-a-kind copy of Harry Potter And The Philosopher's Stone contains revealing commentary and 22 of the author's own original illustrations. The book, which was published in 1997 and went on to bring Rowling worldwide fame, was sold to a telephone bidder at Sotheby's in central London.
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Stamp duty is to be abolished for first-time buyers on properties up to £300,000, Chancellor Philip Hammond has announced in his Budget.
The money will help pay for mental health and counselling services, regeneration in the west London neighbourhood and a new community space.
The small device was hidden in a grate in the ceiling in the only customer toilet at a Starbucks coffee shop.