Postcard-sized artworks by Tracey Emin and David Hockney are among more than 500 being sold for as little as 99p at a secret charity auction.

The world-famous artists have contributed pieces along with hundreds of unknowns, including a four-year-old girl and a 100-year-old retired teacher.

Their works are being exhibited at the Towner art museum in Eastbourne, East Sussex. Without knowing who has created the works, people can bid for them on eBay until the auction, called The Big Art Secret, closes on Sunday.

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Proceeds will go to St Wilfrid's Hospice.