Why not include the Malta or Lion class ships in this AU? Or the new Heavy cruisers were being built... don't forget about the 'G' class either...
Have patience Philbob
As the Majestic conversion was unsatisfactory as a missile cruiser; and bearing in mind that in real life the RN faced a lack of suitably large hulls to ship the new Seaslug sam, we are fortunate that here we had the Minotaur class built postwar as missile cruisers. The Illustrious served to get the Seaslug afloat and helped to bring the system into service; but as so often happens, by the time the Illustrious was commisoned the new Admiral class crusiers wern't far behind. The first two in service were mixed gun/missile cruisers: HMS St Vincent and HMS Collingwood, roughly comparable to the similar sized crusiers in the U.S. and Dutch navies, but carrying more modern gun armanent: the new dual 6-in twin and the new 3-in/70 dual guns, plus (when ready) the Seacat system. Here the Seaslug/Blueslug used the new twin launcher as the triple launcher used on the Illustrious was too bulky. Also, the missiles were stowed and armed horizontally to allow better stowage and hull protection below decks (On the Illustrious the system was stowed more vertically, which was passible on that hull, but created large internal spaces).
The great concern at the time was the steady build up of the Sverdlov class and rumours of even bigger Soviet warships in development. It was reckoned that the gun armed Admiral class could easily deal with a Sverdlov, just with its main guns: soon overwhelming the enemy ship with rapid fire. These were large sophisticated ships that took some time to realise their worth, due to problems with the new weapon and radar systems. In service they were attached to either carrier task forces to act as escort, and in support of amhibious forces, where their guns proved useful, plus their ample command facilties were useful when leading smaller units. Once the Seaslug became obsolete the two gun armed Admirals were retained due to their value in command role; the seaslug was removed and a helicopter hangar substituted. These two make a pair, whereas the next two; the Hood and Nelson were completed to a diferent appearance, and these will follow....watch this space