The "London"s' armour scheme was similar to that of the "Canopus"es, although, unlike in the earlier ships, the waterline armour belt of Krupp cemented armour extended the length of the ship. The thick portion was long and ran from just aft of the forward barbette to a point abreast the aft barbette, and had a total height of of which was above water and the remainder below water at normal load. The thickness of the forward belt armour reduced in steps to the stem and there was a belt running from the aft barbette to the stern. A bulkhead extended obliquely from the aft end of the main belt to the rear face of the aft barbette.