The Navy (and the RAF) were a totally different service to the Army and used their own for of small-arms instructions called BR's, Although they generally followed the EMER's, I can't really say anything about their kit except when it came through our huge workshops their No4's (they didn't have No5's or L1A1's then) and revolvers were all repaired to the EMER. The only 'service' No1 rifles I ever saw were hundreds of EY rifles in the late 60's/early 70's and those service and DP rifles with Cadet Forces. They would all be rebuilt to current EMER spec., that is Mk3/1