The original drawing is dated "25-5-40", so 25th May 1940. Around the time the very first No. 4 T rifles were set up. So in my opinion they might had not decided yet which rifle to use as basis for the official WWII sniper rifle, but dropped the P.14 with No. 32 scope later in favor of the No. 4 T (whatever the reason might had been).
Jim, the cheekpad might be helpful, but it isn't that uncomfortable without it. In fact I believe the optical axis is even lower than on the No. 3 T with the PPCo scope.