Type 23

The Type 23 Duke class was originally developed around anti-submarine warfare requirements, replacing older frigates and supporting towed-array sonar operations in the late Cold War. The design evolved into a more general-purpose frigate with a strong ASW core. Royal Navy ship pages continue to describe Type 23 vessels as versatile frontline frigates, while Naval Technology profiles the class as a central Royal Navy escort design. The class entered service from the late 1980s and remained important for decades.

Type 23 capability depends on a balanced escort package. The ships can conduct anti-submarine warfare using sonar and embarked helicopters, defend themselves and nearby units with missile systems, conduct maritime security patrols, and support naval gunfire or boarding operations. Later upgrades, including Artisan radar and Sea Ceptor on many ships, helped extend relevance. Their size and versatility made them useful across high-end NATO tasks and routine presence missions.

Type 23 frigates carried much of the Royal Navy's escort workload after the Cold War. They deployed for anti-submarine patrols, Gulf operations, counter-narcotics, maritime security, and NATO tasks. Their long service life also created sustainment pressure as the Navy waited for Type 26 and Type 31 replacements. In historical terms, the Type 23 is important because it shows how an ASW-focused Cold War design became a flexible global frigate in the post-Cold War fleet.