The book is also in the Top 100 under Crime - Thrillers and Mysteries - Police Procedurals at No. 33 and No 56 under Books - Fiction - Humour.
And it's not even only priced at 70p. It's currently selling for £1.79. Though I priced it at £2.12, amazon alters the price depending on what it's selling for on other devices.
Under all categories, it's at No 1,968 - not bad when you consider the number of books up for sale on amazon. It's quite made my weekend!