The launch of Mary Whitehouse’s ‘Clean Up TV’ campaign (in 1964) made her a byword for censoriousness. Her letters are now preserved in the archives of her National Viewers and Listeners Association. Sifting through this unique compendium of outrage and affront, Ben Thompson uncovers a startling new perspective on Mary Whitehouse’s stand against a tsunami of swearing and sexual license. But far from the last of a dying breed, might she actually have been the harbinger of change in the tide of cultural history?