A true Lee Speed Sporter does not have any military acceptance marks. They were a commercially produced rifle for private sale and as such were finished to a higher quality. Triggers were better, stock wood was higher quality and of a better fit, and the sights were different. They were also offered in various grades, from a quite standard rifle with little difference in appearance to the military version other than the abovementioned, to "Best Gun" quality from the big name makers. Quite a few were purchased for military use by officers who were allowed to use their own kit if they wished.
I have a low end BSA, but the feel of this rifle is far and away much better than most converted military rifles. I also have a commercial LSA N01 Mk1 that was in full military trim. It was converted here to a range pattern rifle many years ago. There is a pretty fair chance that this saw service in the Boer war from the regimental marking on the butt plate, and was then converted to a range pattern by shortening the woodwork and fitting a new barrel here after WW1. Both of these rifles are a much higher quality of finish than the Enfield No1 Mk3 made in 1918 that I have.
Regards
LesLeeSpeed