We don't know that for sure, Lowell. A guy who actioned in London during the day might be interested in timing a neighbors"Brummie" ejectors over a pint in the evening-what the hell, it is a safe bet the actioner couldn't afford the London gun to begin with, and owned a Brummie himself. Further, I daresay, there is nothing wrong with a set of locks that say "Brazier" on the inside surface, and more than one London gun has proudly worn them.
Best,
Ted