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1850 Slater's Directory of Manchester & Salford, 1850 listed Bott & Allen as copper, tin and zinc packing case makers, brassfounders and gas fitters, 21 Pall Mall. Works: 48 Sidney Street, Chorlton on Medlock. Also listed: George William Bott, brassfounder (Bott & Allen), Old Trafford
21 Pall Mall (off Market Street) was an address shared with a number of other businesses, and was no doubt an office. Reference to the 1850 directory, and to the 1848 O.S. map indicates that the premises in this street were, or had been, large terraced houses. Presumably the area had moved downmarket by 1850 if it was now home to a brass foundry. No. 48 was at the eastern end of Sidney Street.
1853 Partnersip between George William Bott and James Allen, brass founders, manufacturers of Fenton's Patent anti-friction metal, and general tin and copper smiths under the style or firm of Bott and Allen, dissolved by mutual consent. Business to be continued by George William Bott 
The firm was probably the successor of Fenton and Bott