Lorne, I suspect your information came from the IGC, but some time ago as John Smith has recently carried out additional excellent research which has thrown new light on WP Grey.

I quote from IGC: "There are reports that in 1847 William Moore and William Parker Grey, who had been clerk and then manager for Joseph Manton, went into partnership in London at 78 Edgware Road, but this is incorrect. The William P Grey who went into partnership with William Moore was William Patrick Grey, a wealthy lead merchant and lead manufacturer who had a son named Frederick Hargrave Grey who was apprenticed to William Moore. Undoubtedly, William Grey was a live pigeon shooter, a market that William Moore supplied, and undoubtedly he bought himself and his son a partnership in one or more of the branches of William Moore's business. The partnership operated as Wm Moore & Grey but Wm Moore also continued to trade as Wm Moore & Co [this name was used for his export guns]. William Grey was recorded in the 1851 census as a 56 year old (b.1795) leaded glass merchant employing 6 persons. He was living at 3 Abbey Place, St John's Wood with his wife, Emma (b.1803), their children, John B Grey (b.1829 followed his father in the lead business), Frederick H Grey (b.1831) who became a master gunmaker but then took over running the lead business, and a niece, Emma H Buchan (b.1830) and a servant."

It is Frederick H Grey who was running the Wm Moore & Grey business by 1861. The census of that year has him at the WM&G Bond Street address: "At the time, F H Grey was described as a "gun maker master employing 12 men and 1 boy wholly and many more latterly in their homes"." His father, WP Grey died in 1864.

I had not included this in my first reply as the OP was clearly more interested in the Moore & Harris relationship. It's interesting that Wm Moore had diverse dealings which included Joseph Manton, the London best gun trade, the Birmingham trade, exports to USA and with the above mentioned WP Grey. Frederick Beesley and Henry Atkin also had involvement with the firm, though after Wm Moore's suspected death (see above).

Tim

Tim