Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 134,016 pages of information and 212,992 images on early companies, their products and the people who designed and built them.
1927 Established as a private company
1939 Engines built under licence from the Swedish Atlas Co in sizes 48 to 192 bhp. 
1961 Manufacturers of diesel engines. 
2000 Purchased Kelvin Diesels.
British Polar Engines Ltd website.