Interesting posts so far. I would be interested to see if the OP's Lee Metford is a Lee Speed variant or one produced for the military. Given the amount of changes that was happening in the 1890s, finding an original issued Metford that wasn't upgraded to a later pattern, and is in decent shape overall, would be quite the find.
Lee Metfords were sold to small family outlets as well, by the factories making them.
Many well known "makers" back in those days did their magic to the rifles they purchased, then resold to customers in various forms, some of which were indistinquisable from the military option, other than bedding and trigger work, to make them more accurate in competition, and likely some went to school shooting teams, maybe even in quantity, because at the time, shooting was a well respected sport and skillset.
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Lee Metford MkII rifles were rebarreled with Enfield rifled bores. The Lee Metford rifle was originally designed to use Lee barrels, but many of these rifles were later rebarreled to accommodate Enfield rifling, which was more durable and easier to clean. This transition occurred as the Lee barrels wore out and the need for a more reliable firearm arose.
Rifleman UK+2"
The family has provenance for the rifle, but from the post, it wasn't clear, to me, if the rifle was issued to the relative or one of the rifles issued to the unit he served with. Maybe I missed something?
Whatever, it's a lovely rifle, and no matter how much we would like to say the rifle was actually issued to the relative, it will likely not be known.
Some officers bought their own weapons, and I have a Webly Mk1, 476/455 which was purchased by an officer sent to the Boer War, only to settle on a piece of land deeded to him for his service, about 10 kliks from where I presently live. There is a record of the purchase, which I had to provide to get a letter of "antiquity verification" from the CFC, so it could be deregistered.
That's why I asked about engraving on the action dust shield.
The officers purchased firearms using "issue ammunition," because of logistical issues in the field. Some officers purchased odd ball stuff and had to supply their own ammo as well.
There may be a lot of verifiable history behind the rifle in the OP's pic. That's most of the fun in obtaining such firearms, searching out the provenance.
Good on you OP for helping out the family with this matter.