Of the whole Lee-Enfield family, the No.5 Mk.I is probably the most obscure variant to enter production, and was certainly the least successful. Only seeing action in the final part of WWII, it went on to have a fairly long postwar career around the world.
(A No.5 Mk.I Jungle Carbine as used by British troops during WWII in 1945, and carried by a Kenyan game warden in 2008 showing the distinctive buttpad.)