Replacing Britain's WE.177 tactical nuclear weapon

If WE.177 had remained in service, when and with what would Britain have replaced it?

A late-1990s replacement was likely, preferably a jointly developed guided tactical nuclear missile rather than another free-fall bomb.

The retirement period itself suggests the WE.177 family was approaching replacement age. A free-fall successor would preserve the existing role, but a guided or cruise missile would improve aircraft survivability, particularly for Harriers that otherwise had to escape their own weapon's blast. Britain might have joined a French or Norwegian program because adapting an anti-ship missile would not automatically provide the range, targeting, and nuclear integration required.