3/4. The Blackest Day? Evan Davis charts the controversial rise of the comprehensive school. In the 1970s the battle over comprehensives entered the classroom, with arguments about "mixed ability" teaching. Was this the natural conclusion of the "comp" revolution or the final descent into trendy madness? Davis revisits his old school to relive the excitement and turmoil of "going Comp" in 1976. Producer Phil Tinline Repeated at 9.30pm