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Will the longer MK I cases chamber in S&W's chambered for .455 Webley?
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There is an easy way to find out.
If you don't have a fired .455 Mk I case, get a fired .45 ACP case and insert it to test for chamber length. If it goes in flush, or nearly so, with the back of the cylinder then the .455 Webley Mk I will also fit since its case length is the same.
Of course, just because a round will chamber does not mean it is safe to fire it in that particular revolver. Remember that many British revolvers were made during the black powder era and it is not safe to shoot smokeless rounds in them.
Also, some revolvers were converted to accept .45 ACP when they were imported to the US. These conversions were done to increase sales, often with little or no regard for safey.
It may be wise to do a thorough investigation, including advice from a knowledgable gunsmith, before shooting one of these old revolvers.