"The main thing in prison is to keep in contact with your family. It's the most important thing... But you can't afford to do it. You could write a letter but some people can't write. And the sewing's so easy to do, and that's the best bit, because a lot of people in prison are illiterate. They can't read and write and they can't count. But you teach them to count to ten and they can do the sewing."