At first a wholesale business, in 1917 a large number of London retailers joined the company.
[1] So successful was the merger under chairman Sir Reginald Butler, that the company began to expand, buying other dairies and creameries across the United Kingdom.
After the war ended, it bought businesses in Birmingham, Cheshire, Liverpool, Sherbourne (Warwickshire) and Wales.
In the late 1920s, United Dairies helped pioneer the sale of pasteurized milk in Britain.
United Dairies operated milk trains with all four of the main railway companies.