On looking closely at the pics, it seems to me that the butt socket markings are very naive compared to the otherwise pukka rifle. It simply doesn't add up to a hand-made copy.
Shortened Long Lees were made for private purchase around the time of the Boer war, and were quite popular with Britishofficers. I have some photos somewhere.
Now, the rifle in question has been converted to charger loading and the CLLE sight upgrade, but, apart from the naive markings, it could be a private purchase short rifle made pre-WW1. Alternatively, it may be a composite of rifle parts, some private purchase and some broad-arrow marked (like the butt plate).But not necessarily of Khyber Pass manufacture, apart from teh stamps on the buttstock...
I wonder if this is a rifle which has been "enhanced" in the bazaar? Can the rifle be dismantled to show the concealed markings?