Here are a few more photos with some barrel markingsIt's a commercial build lee Enfield rifle. It seems to be a Metford barrel due to the lack of "E" stamped into the Knox form. So I guess its more correctly a commercial built lee Metford rifle.
It may be a commercial sporting rifle or a commercial mill spec rifle. Some were built from factory as sporters.
Post pics of the whole thing
I think the lee speeds had a short curved bottom magazine.I believe it has the wrong magazine and it also appears to have had its fore end cut back. The butt stock appears to be a replacement as well.
Still, a very nice rifle, and seeing as it has sentimental value, I would leave it as is.