Pics are low resolution, so it' s difficult to tell you anything except in a generic sort of way. Jones rotary underlever hammer gun with rebounding hammers. Looks to be in very good condition. You say the name is P.Webley, which would make it pre- 1897, when the company merged with W&C Scott to form Webley & Scott. From the time frame, almost certainly a BP express. A clear pic of the proof marks would be helpful. There should be an address on the locks or barrels as well.
Bores look to be in very good condition, but the colour is gone from the action, so it's likely this gun has seen some use. I would put it back in action again if it were mine.