Is it a Webley or a Eley Colt .455? How to tell if the cylinder bore has been modified to accept Colt 45 or other ammunition. Obvious the barrel (8" smooth bore) and sights were replaced

Please help an ole man out that happens to know "Nothing" about Colt Double Action Revolvers... At 66 I guess it's never to late to own a Colt! Is it a Webly or Eley .455 ? It is not a top break down revolver as the article indicates is the characteristics of a Webley. It is a thumb release roll out 6 shot cylinder characteristic of a Colt revolver. How can I tell if it's been reworked to accept Colt 45 ammunition? As many details as I have are below. Any body know just what I have here? I think I have a 1914?? British .455 Colt New Service Revolver. Has some standard factory Colt proof marks along with British proof marks. Colt logo above the grips on the rear left side of frame, VP inside a triangle on the front left side of trigger guard, and a #3 on the rear of trigger guard same side. Has had the orig. barrel replaced with a stainless steel 8" smooth bore pinned barrel. British proof marks on 3 different places on the revolver. On the breech area, the rear of the cylinder, and inspection and acceptance markings On the left rear of the frame (just below the hammer). Broad arrow government acceptance mark on top. Under that is a Crown Under that is F9 E Bone grips that look like they are orig. also. A large #7 is stamped "under" the serial number at the crane too, and the grips are also marked with the #7 in pencil underneath on both grips. On the left side of the frame under the grips is stamped the capital letter "E", so I know originally it was chambered .455. Highly polished mirror like blue finish on the original frame. Has a lanyard swivel on the bottom of the frame and has "No markings, lettering or numbers on the frame"by the lanyard swivel. Any Help/Feedback is Greatly Appreciated Thanks in Advance!