I am curious as to how many Type 43s were planned, when they were to have been ordered and were the Batch III Type 42s ordered instead of them or were they always planned to serve along side them? Were they intended as DLGs and replacements for the Counties?
With the Falklands experience it always surprised my that the UK didn't proceed with the sale on Invincible and perhaps one or both of her sisters as well with the aim to build two or three larger more capable carriers instead. Deletion of Sea Dart and the associated systems would have saved a considerable amount of cash, perhaps enough to have built a Hermes or Victorious sized alternative.
Invincible to Australia, Hermes retained; new 30000ton STOVL carrier constructed, Illustrious to India; second new ship completed, Ark to Australia; third new ship completed, Hermes offered to India or scrapped. RN ends up with three new large carriers flying 30 odd FA2 Harriers and various Sea King types.
Type 23 retained as originally intended (a towed array sonar tug) and a number of Batch IV Type 22 built, to replace the Type 21. A new multi-role destroyer is developed to follow on from the Type 42, possibly even using AEGIS, to replace the Counties and Bristol. I remember seeing a pre-Horizon sketch of a UK destroyer that was slightly larger than a Ticonderoga.