 The work included removing her main deck 6-inch guns and the upper deck 12-pounder guns and moving four of the 6-inch weapons to the upper deck battery where the 12-pounder guns had been located.In February 1918, "London" moved to Rosyth and began conversion to a minelayer.The conversion included removal of all four of her 12-inch (305-mm) guns and her anti-torpedo nets, replacement of her after main-battery turret with a 6-inch gun, and installation of minelaying equipment on her quarterdeck, including rails for 240 mines, and of a canvas screen to conceal the entire quarterdeck from external view.