Why the Type 43 destroyer was studied with Harriers

Why did a Type 43 destroyer concept include Harrier aircraft?

To test whether destroyers could host fighters and offset carrier needs, even if the study ultimately demonstrated the concept's problems.

The hover-capable Harrier suggested that fighters might operate from destroyers and reduce the need for carriers. The Royal Navy sometimes develops detailed studies, like Skyhook work, precisely to show why an apparently attractive concept cannot be made operationally sound.