The story
Eton College graduate Michael McEvoy began his engineering career at the Rolls-Royce factory in Derby and started McEvoy Motorcycles in 1924. The first bike from McEvoy Motorcycles was a flat twin produced in 1925 with a British Anzani 1100 cc engine. By 1926 the business was successful enough for McEvoy to leave his job at Rolls-Royce and move to larger premises in Derby. The McEvoy range was developed to include a JAP8/45 hp engined V-twin in an advanced "super sports" frame that was capable of 100 miles per hour (160 km/h) and advertised by McEvoy as "the Fastest all-British big twin that holds all high speed British records worth holding in its class".
McEvoy began producing motorcycles with a range of engines, including one with a small 172 cc Villiers engine. All was going well until the company's financial backer, Archie Birkin, died practising for the 1928 Isle of Man TT; the company was wound up in 1929.
From Wikipedia’s article on McEvoy Motorcycles, shared under CC BY-SA 4.0.4