1) When the first two ships of this class, Lion and Temeraire, were laid down in mid-1939, it was estimated that they would complete in July and September of 1942.  They were instead repeatedly postponed starting in October 1939, with the few hundreds of tons of material actually assembled being scrapped in 1942-1943, but they were not formally cancelled until 1946.

2) Balance weight would have added a little less than 13 tons (14 mt).

1) Propellant was to be in six bags and flashless.

2) Projectiles for the Mark II and Mark III guns were limited in length to 73 inches (185 cm).

3) APC was 6/12crh.

4) Although the HE projectile for these guns was the same weight as those used for the older 16" (40.6 cm) Mark I guns on the Nelson class battleships, they were to a shorter design, as the older projectiles were too long for the new mountings.  It was intended to also issue these rounds to the Nelson class battleships.

5) For Treaty compliance purposes, the "standard tonnage" ammunition stowage was listed as being as low as 60 rounds per gun, but the actual stowage capacity was actually at least 100 rounds in all pre-war designs.  Some of the late war design studies showed as much as 120 rounds per gun.

6) The redesigned mountings for the Mark IV guns could have handled projectiles up to 78 inches (198 cm) in length.  Although projectile designs were not finalized at the time of cancellation, the plan was to design the best possible CP shell (base fuzed HE) that could be made to fit in this length.  This shell was expected to be able to inflict heavy damage against light armor up to 3 inches (7.62 cm) thick.  The APC shell would have been designed to be the same weight as this CP shell, but optimized for performance against deck armor.

7) The Mark IV guns were intended to be able to operate at pressures up to 24 tons/in² (3,780 kg/cm²).  This high pressure would not have been necessary for the planned naval projectiles, but it would have allowed special, lighter projectiles to be fired across the Straits of Dover.  This would have required the use of super-charges and hence the need for higher barrel pressures.

1) These 40 degree ranges are from the three different sources listed below and may reflect differences in propellant temperature as well as wear (new gun vs. average gun).  It is interesting to note this wide disparity in range for only 83 fps (25 mps) difference in muzzle velocity, which is really an indication of just how little information is available for these weapons rather than a reflection of their true ability.  It does make for an interesting example of the unreliability of data for weapons that never make it past the prototype stage.

2) Time of flight for APC Shell with MV = 2,400 fps (731.5 mps)
   10,000 yards (9,140 m): 13.8 seconds
   20,000 yards (18,290 m):  31.3 seconds
   30,000 yards (27,430 m):  54.3 seconds
   38,000 yards (34,750 m):  82.3 seconds

1) The gun axes were 102 in (259 cm) apart for both the Mark II and Mark III designs.

2) The Mark II mounting was similar in design to the 14" (35.6 cm) quadruple mountings used on the King George V class.

3) Many of the preliminary designs and the 1937 draft Staff Requirement TD 60A/38 showed a maximum elevation of 30 degrees.  This elevation was adopted as part of the formal Staff Requirements approved by the Admiralty Board in December 1938.  The maximum elevation was not raised to 40 degrees until the 1939 Staff Requirements were adopted in February 1939.

4) Even though construction of Lion and Temeraire were halted soon after the war began, work on their six turrets continued well into the summer of 1943.

5) In 1944, a new mounting design using the Mark IV guns was begun.  Designated as the Mark III, this design was never finalized.  The Mark III had a number of improvements over the Mark II, including greater flash protection and single-stroke ramming.  It has been speculated that these mountings would have achieved a ROF of about 20 seconds, but there is little evidence to support this figure, as no detailed design of the turrets was ever completed.  At the time the design was halted in 1949, the sketches for it were in a very preliminary state and some fundamental problems such as finding enough space to rotate the ammunition from a vertical to a horizontal position were unresolved.