Watch: David Hockney's iPad paintings in new exhibition

David Hockney, the world renowned artist from Bradford, is showing 20 pictures of flowers at Salts Mill gallery in Saltaire, West Yorkshire. The illustrations were created digitally using an app designed for 87-year-old Mr Hockney.

The free exhibition is the first time this artwork has been shown outside London and is part of the artist's support for his home city's culture celebrations this year.