We're Going on a Bear Hunt: 'The editors were so excited they were nearly weeping'

It's 25 years since the publication of children's classic We're Going On A Bear Hunt, since when it's become a firm favourite with families all over the world. Here, author Michael Rosen and illustrator Helen Oxenbury shed some light on the origins of the story – and how the book could have looked very different had Helen not ignored Michael's original ideas