Michael Rosen on how he got into writing

Why is author Michael Rosen dressed up to look like Scrooge?

Is it because he doesn't like Christmas or maybe it is because he has a new book out called 'Bah! Humbug!' which is based on the Dickens' classic - 'A Christmas Carol'.

He tells Newsround about his new book, how he got into writing and where he gets his ideas from.