David Hockney: 'When I paint, I feel I'm 30'

He's one of the world's most influential artists and at 77, David Hockney doesn't appear to be planning to retire any time soon. Jon Snow asked him about his use of photography together with paint in his new show. .Sign up for Snowmail, your daily preview of what is on Channel 4 News, sent straight to your inbox, here: http://mailing.channel4.com/public/sn... Missed Channel 4 News? Catch up on the last seven days here: http://www.channel4.com/news/catch-up/ Channel 4 News weather forecast, with Liam Dutton: http://www.channel4.com/weather/ All the latest blog posts from the Channel 4 News on-screen talent: http://blogs.channel4.com/news/