Downton Abbey creator Julian Fellowes is to write a West End musical based on Kenneth Grahame's classic children's book The Wind in the Willows.

The Press Association says Fellowes will work with composer and lyricist duo George Stiles and Anthony Drewe on the project, having written the Mary Poppins musical with them 10 years ago.

"The Wind in the Willows is one of our greatest classics, and as true and entertaining now as it has ever been," said Fellowes.

"I am delighted and tremendously flattered to have been asked to write the book for the new musical.

"In fact, I suspect this is something I've been wanting to do subconsciously for many years."