Vincent Motorcycles was a British manufacturer of motorcycles from 1928 to 1955. The business was established by Philip Vincent who bought an existing manufacturing name HRD, initially renaming it as Vincent HRD, producing his own motorcycles as HRD did previously with engines purchased as complete assemblies from other companies. From 1934, two new engines were developed as single cylinder in 500 cc and v-twin 1,000 cc capacities. Production grew from 1936, with the most-famous models being developed from the original designs after the War period in the late 1940s.

J. A. Prestwich Industries, was a British engineering equipment manufacturing company named after founder John Alfred Prestwich, which was formed in 1951 by the amalgamation of J. A. Prestwich and Company Limited and Pencils Ltd.