How Type 43 would have enlarged Type 45

How would Type 45 have changed if the double-ended Sea Dart Type 43 had first replaced early Type 42s?

Type 45 would probably have been larger and carried many more air-defence and strike missiles because it had to replace a more capable predecessor.

Replacing Type 43s with two Sea Dart installations would require a larger Type 45 carrying more missiles. The predecessor's capacity would shape what counted as an adequate replacement. The discussion then points to the historical Type 45's provision for strike-length Mk 41 cells as an example of capacity that was allowed for without installing the weapons.