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Hughes and Lancaster of Acrefair, Ruabon, Wrexham, Denbighshire. Also of 47 and 16 Victoria Street, Westminster, London (1937); see details on adverts.
1865 Company established by John Hughes
Presumably this involved John Hughes, C.E., of Millwall Ironworks and C. W. Lancaster, the noted Gun Maker of Bond Street and the inventor of the Lancaster or elliptical-bored ordnance, who were plaintiffs in 1866 in a legal action against Captain Blakely concerning methods of construction of ordnance.
1890 Tramcar running in Preston on compressed air. Article and illustrations. 
1892 Two engines for Eastbourne Corporation (Central Compressor Station).
1903 'ENGLISH FIRM'S SUCCESS
An all-European competition for the contract to provide the important city of Oporto in Portugal with a complete drainage system has been won by a London firm of engineers, Messrs Hughes and Lancaster of 47 Victoria Street. Oporto, although the second largest city in Portugal, having an estimated population of nearly 123,000, has, like many Continental towns nearer England, a very primitive system of drainage. The municipal council determined some five years ago to bring their city more up to date in this respect, and the leading engineers and contractors of Europe were invited to submit plans and estimates. It was not, however, until two ago that the council made a final selection resulting in Messrs Hughes and Lancaster gaining one of the most important contracts ever granted by a foreign municipality to an English firm.
What is known as "the separate system " will be adopted in conjunction with Shon[e] ejectors. By this method sewage is automatically raised by compressed air, rendering the aid of gravitation unnecessary. It is a modern system of drainage as yet not introduced in London except in small undertakings. The Houses of Parliament are thus drained, the pneumatic ejectors being situated under Speaker's Green. Messrs Hughes and Lancaster will be required to lay between sixty and seventy miles of sewage pipes under Oporto and construct numerous large ejector stations. The value of the contract has not been disclosed, but it enters well into hundreds of thousands sterling.' 
1914 Manufacturers of Air-compressing machinery, Rock Drills, "Shone" Pneumatic Automatic Ejectors and Sewage and Water-raising Apparatus generally. 
1937 Sewerage engineers. "Shone" Pneumatic Automatic Sewage Ejectors.