Watch on 123Movies. Jon Barton of Vertebrate Publishing returns to Old Friends (E4 6a) at Stanage — a route with a deeply personal history after a previous accident. This time, he’s back on the grit to celebrate the release of the brand-new edition of Extreme Rock, compiled by Grant Farquhar and published by Vertebrate. The original Extreme Rock by Ken Wilson and Bernard Newman has become a cult classic in British climbing literature, with first editions now fetching around £500.