RealClassic BSA MC4 PROTOTYPE The design offices and workshops of the British motorcycle factories of the 1950s, 60s and 70s were littered with promising designs which were supposed to transform the industry but came to nothing. Built by dedicated designers, engineers and apprentices, they include Norton’s Unified Twin, Bert Hopwood’s modular range of Triumphs, the BSA-Triumph Bandit / Fury twins, Triumph’s Thunderbird 3 and four-cylinder Quadrant and Ariel’s 10OOcc flat four version of the Leader. They were all, it was promised, going to keep dealers busy or, by the 1970s, to turn around falling sales. After assorted efforts these machines appeared in prototype forms (except for Hopwood’s modular efforts, which only existed on paper) and then vanished into the mists of time and dusty corners of motorcycle museums. Sadly, senior managers…