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Robert Warner and Co of Hall Lane, Walton-on-Naze, and 97 Queen Victoria Street, London
and of 14-16 Cockspur Street, London, and Walton-on-the-Naze. (1919). 
Presumably the business of Robert Warner (1815-1896)
1900 June. Royal Agricultural Show at York. Showed 'a large variety of pumps'. 
1903 Showed a windmill at the 1903 Royal Agricultural Society's Windmill Trials.
1907 Robert Warner and Co (Engineers) Ltd was incorporated, of 14-16, Cockspur Street, London, S.W.1.
1911-14 Known for their steam pumps.
1922 Robert Warner and Co (Engineers) Ltd, General Engineers and Ironfounders. Manufactured pumps, boiler feed-water regulators.
The works manager at A. G. Mumford also had an interest in this company and the pumps were similar in both companies