The company had an annual output of 1.8 e6hl.

Watney Mann was formed in 1958 with the merger of Watney, Combe, Reid & Co. Ltd with Mann, Crossman & Paulin Ltd.

When the Stag Brewery in Victoria was demolished in 1959 the name was transferred to Mortlake Brewery.

The business acquired other brewers, including Wilsons of Manchester, Phipps NBC of Northampton, Samuel Webster & Sons