Otto Monsted, a Danish margarine manufacturer, built a large factory at Southall in 1894. The factory was called the Maypole Dairy, and eventually grew to become one of the largest margarine manufacturing plants in the world, occupying a site at its peak. The factory also had its own railway sidings and branch canal. The Maypole Dairy Company was later acquired by Lever Brothers who, as part of the multinational Unilever company, converted the site to a Wall's Sausages factory which produced sausages and other meat products through until the late 1980s.