The writer Katharine Whitehorn chooses Mary Stott, the great campaigning journalist and the first editor of the Guardian women's page. She's the journalist who more than anyone started the revolution in women's journalism since the 1950s. She gave ordinary women a voice, and a place to get together and share ideas. Liz Forgan, who was to edit the women's page later, shares her memories of working with Mary, and Matthew Parris presents.