As part of an extensive refit at the beginning of 2011, "Northumberland" received several significant technology upgrades. The Sea Wolf point defence missile system was upgraded with the Sea Wolf Mid-Life Update (SWMLU – pronounced "swimloo") which substantially improved the range, performance and reliability of the system. The combat system was upgraded from outfit DNA to DNA2, replacing the combat system architecture to improve redundancy and system performance, and a software upgrade which significantly improves overall functionality and sensor integration, as well as providing MMI convergence with the Type 45 destroyer's command system. The two 30mm BMARC cannons were replaced by two 30mm Automated Small Calibre Gun (ASCG) mountings. These allow remote control of the mount via operator consoles and integrated Electro Optic fire control. Additional modifications improved habitability and reliability in high ambient temperatures.