No Paul, this can't be. What the picture posted here doesn't show, the drawing is dated 25-5-40. Since according to the MKLicon entry of the No. 4 T trials rifle says the first rifles were converted in May 1940 at RSAF Enfield this exactly fits to the date of this drawing. So possibly a last-day decision in favor of the No. 4 rifle instead of the P.14?