Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,772 pages of information and 210,006 images on early companies, their products and the people who designed and built them.
O.C.O. manufacturing based Olympia House/ Mill, Selby, Yorks and Union House, St. Martins le Grand, London, EC1. which operated the largest linseed oil crushing and refining plant in Europe.
It also processed hardening whale oil.
OCO provided 'the first village estate' of workers' housing soon after 1910. 
1929 advert says it made Soycot Cake, balanced ration dairy cubes, milk ration cubes, sheep and lamb cubes, complete pig food cubes etc.
Company dissolved in 1989.