That wide engagement envelope, plus the all round great performance of the Red Top and it's big warhead makes me think it would be a good weapon in air superiority type air to air combat in the mid-late 60s.
I haven't really seen anything to suggest that Red Top or Firestreak had much if any capability against manoeuvring fighter type targets. Almost all the performance data is vs non manouevring targets. There's a bit vs targets doing 2g manoeuvres but this massively shrinks the firing envelope to rear 20deg (ish) sector only. The big warhead isn't necessarily an advantage if you have higher miss distances from worse guidance/fuses (definitely one reason why Red Dean and Hebe were so ginormous).
Secondly when you cut away all the focus on VTOL the RAF wanted a supersonic, radar equipped, Red Top (and AS-30?) plus A2G ordnance armed tactical fighter that wasn’t vulnerable to being destroyed on the ground in air attacks.
I don't think that is the case in this time period. There was a need for an interceptor (Lightning) to help, protect the V bomber bases before Bloodhound came in. Then there was a separate need for a tactical bomber (and recce) to reliably survivably deliver Red Beard - this meant a better nav system, low and fast, terrain following, and then VTOL to survive on the ground. My understanding is that there no requirement for air-to-air combat, or even supersonic peformance - the supersonic performance was simply a fall out of the high Mach low altitude requirement. It was the RN that wanted an air-to-air fighter at this point to replace Sea Vixen.
Then there was a separate need for small numbers of aircraft to deliver conventional weapons in lower threat environments in other conflicts. Existing airframes with minimal mods for bomb/rocket carriage and drag chutes were the cheapest way of doing this.
Fourthly the British were the only country where the VTOL mania of the 60s ruined the Air Force and aviation industry, which I believe is because far too much commitment was given to it.
I don't really understand this comment. VTOL was very much a secondary activity compared to the main aircraft programmes. HSA / UK Industry did very well out of the Harrier compared to almost every other programme - this circles back to the first post of Harrier being one of very few export "successes".
I don't see how eliminating some of the programmes you're on about really changes things:
TSR2 is still pretty doomed from financial and organisational mismanagement, technical feasibility, and being too early for miniaturised avionics. Even if it enters service the world changes to flexible response and the RAF needs more tactical strike aircraft (Harrier, Jaguar, Tornado)
The RN still needs a Sea Vixen replacement
The RAF still needs a Lightning replacement in time
There still need to be trainer aircraft
With hindsight we could definitely spend less money on programmes that failed, but I can't see how the small amount spent on VTOL ruined everything else. Or how a more multi-role Lightning really changes any of the above.
The likes of P.1121, a "STOL 1154", or AFVG, or "some pre F.155 more multi-role fighter" do a better job of addressing these issues for me.
Close air support for me is Hunter and then Hawk. Rugged cheap and cheerful.
And Strikemaster which everyone forgets