Blue Book of Gun Values
Here's what little I can find in the Standard Catalog. Incorporated in 1902. Used the names Union Fire Arms, Union Arms Company, Illinois Arms Company and Bee Be Arms Company. In 1917 the company was either bought up or absorbed by Ithaca Gun Company. They manufactured slide action shotguns, hammerless doubles, a few single shot shotguns, and a couple semi-automatic pistols.
What are the markings on the pistol?
You can find information about Russell Arms Co. shotguns online at places like Gun Trader or at many local gun stores. You can also find information online at Shotgun World or Arms List.
the internet
One can find information on the Imperial Hotel in London at the library, through local travel and tourism agencies, online directly at ImperialHotels, and through recreation and travel blogs.
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One of the best references is "Browning Sporting Arms of Distinction 1903-1992" by Matt Eastman.
Yes, you can find information for Stevens firearms at the Savage Arms website. http://www.savagearms.com/
Try e-gunparts.com
I find no listing for "London Arms Co." Provide more information or take the firearm to a local gunsmith for a professional appraisal.
Have you tried a web search. I just did and found quite a bit.