When publishers Bloomsbury decided to publish Harry Potter and the Philosopher's Stone in 1997 it had already been rejected by 12 other publishers but Bloomsbury took a gamble, paid GBP2,500 for UK & Commonwealth Rights and invested in an initial print run of just 500 hard backs.

From such modest beginnings the Harry Potter brand rapidly expanded to become a worldwide phenomenon: seven books, eight films, a play and themed "Wizarding Worlds" in the UK, USA, Japan and China.

In the quarter of a century since launch Harry Potter and his world has captured the imagination of several generations of children, young adults and grownups too. And following the success of our first Harry Potter Quiz Book we're now publishing Harry Potter Quiz Book Volume II.

With hundreds of questions to test your loyalty to and knowledge of the wizarding world this is a must have for Harry Potter fans who want to swat up on their knowledge or simply show off their Harry Potter quizzing skills.

Questions in the new book have been compiled by brother and sister team Oliver and Imogen. Both ardent fans since the age of seven they've each read all the books, seen all the films, been to the play and done The Harry Potter Tour. (And, no doubt, got the T-shirts)

Now teenagers, Oliver and Imogen have compiled a fresh new range of questions which, we hope you agree, will challenge Harry Potter fans of all ages.