Funnyman David Walliams has announced the name of his new children's novel as Grandpa's Great Escape.

The latest book from the Britain's Got Talent judge is described as "a daring adventure full of comedy and heart".

Its front cover, tweeted by Walliams, features a drawing of an elderly man and little boy flying a plane.

The star wrote: "I'm delighted to tell you that my new children's novel is called #GrandpasGreatEscape!"

Last year, Walliams generated upwards of £7 million for sales of his top children's books, making him one of the biggest stars of the literary world.

He shifted more than a half a million copies of Awful Auntie alone, making it the biggest children's book of 2014 in the UK.

And his golden touch for children's titles saw him take four places in the top 50 bestsellers across all genres in the 12-month period, according to figures published in trade magazine The Bookseller in January.

Together the books - which also included Gangsta Granny, Ratburger and Billionaire Boy, each published by HarperCollins - had a retail value of £7,060,788.

In the July 10 edition of The Bookseller, the magazine reported that Walliams has had year on year growth of +30.9%.

His sales are further buoyed by TV adaptations of his books by the BBC with The Boy In The Dress shown in the Christmas schedules, with a starry cast which included Jennifer Saunders, Meera Syal and Walliams himself.

The new title will be released on September 24.