This is being held by Hodder Children's Books. All you have to do is retweet the following tweet!
A #BlueMonday #PleaseMrPanda treat to cheer up all those grumpy faces! RT to win this little guy &the book! (UK only) pic.twitter.com/pPpy9Vhk85
— Hodder Children's (@hodderchildrens) January 19, 2015