While under repair from January–August 1940 after being mined in December 1939, "Nelson" had her aft 6-inch directors replaced by a pair of octuple 2-pounder "pom-pom" mounts and another was added on the quarterdeck. She was also fitted with a Type 279 early-warning radar. Gun shields were reinstalled on the 4.7-inch guns and a pair of four 20-tube UP rocket launchers were mounted on the roofs of 'B' and 'C' turrets. These changes increased the size of her crew to 1,452.