To celebrate the publication of Harry Potter And The Deathly Hallows, Blue Peter has launched a nationwide competition for 25 children to win a trip to see the Blue Peter Studios and guest, JK Rowling.

To enter the competition, children need to write down a question they would like to ask JK Rowling. On the opposite side of their A4 piece of paper, they then need to draw a portrait of themselves, as a witch or a wizard.

For more details, visit bbc.co.uk/cbbc and click on Blue Peter, but hurry, the closing date is Friday 15 June.

Editor, Richard Marson, says: “We have always been great supporter of JK Rowling, so we are delighted she has decided to appear on our Blue Peter special, which will be shown on 20 July.”