On Start the Week Andrew Marr visits the painter David Hockney to find out why he has swapped LA for East Yorkshire. Hockney takes him on a tour of the farm tracks and woods he has been painting near his home in Bridlington, and talks of his fascination at the changes of the season. In his vast studio hang pictures of increasing size and vibrant colour, many painted using his iPad. He might be in his seventies, but Hockney tells Andrew Marr that he's on a roll, busier than ever; excited by the new technology and full of ideas for his next works of art. Producer: Katy Hickman.