Why exported Cold War warships can keep British records closed

Will advancing technology make detailed information on Cold War warships available sooner?

Not while former British ships remain in allied service, because their original systems and design baselines can still make those records operationally sensitive.

The answer doubts that technological change alone will quickly open more Cold War warship records. Former British ships remain important parts of allied fleets, and even modernized vessels still rely on much of their original design and machinery. Releasing detailed British information could therefore expose capabilities or vulnerabilities belonging to the current operator. The fair course is to preserve secrecy until those allied ships also leave service, after which fuller disclosure becomes much more likely.