Common AAW and ASW hulls before NFR-90

Why did Britain study common-hull AAW and ASW frigates, and what ended that work?

Commonality promised cheaper fleets and easier support, but NFR-90 superseded the national studies.

A common hull for air-defence and antisubmarine variants promised savings through building more ships to the same design. Shared electronics and engineering would simplify training and maintenance. Common equipment would also ease logistics, although the benefits are described as theoretical. NFR-90, the NATO Frigate Replacement for the 1990s, is identified as the program that displaced the preceding British work.