Thank you amondg. Yes, that is the man. I know lots about John Millard/Millward, but I am trying to work out why two gunmakers working in London would be insuring a property in Bilston in Staffordshire and what relationship, if any, either Keen or Millward had with George Brown.
George Brown was proprietor of the Brown Lion tavern Oxford Street Bilston in 1842. His grandmother Esther Brown (nee Lowe) was proprietor in 1818. She died in 1826 and was succeeded by her son-in-law George Perry from at least 1828 to 1835, then George Brown's brother-in-law William Turley 1840-41. So it has been a family business. George Brown's uncle Charles Gallimore (1775-1846) leaves legacies to John Millward's sons, and owned a lot of property in Oxford Street, Bilston, including a malting house. George Brown was at one time a maltster, so it is possible the insured address is the malting house - hence my desire to find out if the actual insurance record has any more detail than the catalogue about the property. I know from past experience that the insurance records do sometimes have more information than makes it into the TNA catalogue entry.
Job Keen was born in Tamworth in 1776 and John Millward in West Bromwich in 1773. All London gunmakers probably knew the proof master, but Keen and Millward do also have a family connection. Job Keen's daughter Harriet married John Millward's nephew Charles. That does not answer the question of why Keen and Millward were insuring a Bilston property long after they both moved to London. My best guess is that they were trustees of a will (it is not Charles Gallimore or his father or either of George Brown's grandparents), although normally that fact is in the catalogue entry for the Sun insurance records.
I have extensively mapped out the Gallimore, Brown, and Perry families without finding so far any familial connection with the Millward family. There were obviously some social connections including the will, and John Millward's children witnessing the second marriage of George Brown's wife (he was her third husband).