Frigates And Destroyers (In-Service Life) Mr. Speed asked the Secretary of State for Defence what is the current planned in-service life for the type 21 and type 22 frigates and type 42 destroyer, respectively. Mr. Blaker It is too early to offer a precise assessment; but on current plans we do not expect any of these ships to be phased out before the 1990s and some will continue in service until the next century.