Shame about the photos but thats not too serious. Re the stock, if it still retains reasonable and usable length that again is not too serious. The Whitworth barrels is good !. As to proof marks, you will have two lots, the originals from the 1890's and then the reproof marks from 'post' 1955. Some or even all of the original marks may have been lost. To work out what you have look here for a start : http://www.hallowellco.com/british_proof%20marks%20-%20syntax%20by%20date.htm.
See also where it refers to download PDF file - its all in there.
Just a note on terminology, the metal attached to the buttstock is called the action (in UK anyway) and the flat area where the proof stamp is shown is called the action flats. Likewise the flat area below the barrels is called the barrel flats. Different terminology is used in the U.S.