It could be argued that it would have been cheaper for the UK to have constructed three CVA01 carriers and the associated escort and support vessels, airgroups etc thereby detering Argentinas abitions than it was to retake the Falklands.
Except this is a specious argument. The seizure of the Falklands in 1982 would not have been deterred by the RN's possession of CVA01/2/3, if the government had behaved in the same way as it did in 1979-82. The Argentineans had been deterred in 1977 (by the previous government, headed by James Callaghan) by Operation Journeyman - and we didn't have three carriers then, we had one, working down to retirement next year. All we sent was an SSN (secretly) & two frigates - & Argentina backed down. The important thing was that we showed determination.
In 1979-82 the Thatcher government, all unwitting (it ignored briefings, & took no notice of Argentinean actions, because it didn't think Argentina important enough to pay any attention to), led the Junta to think it was being sent signals that the new British government wanted shot of the Falklands, & wouldn't fight. Deterrence failed not because of our naval strength or lack of it, but because of our perceived unwillingness to act. A couple of frigates & the hint of an SSN & there'd have been no invasion.
Our last CTOL carrier was decommissioned in December 1978. Until summer 1980, all we had was
Hermes - with no ski-jump, & no operational Sea Harriers. Then for the next year, we only had
Invincible. Argentina didn't invade. For the first few months, we had a government that had shown determination to defend the Falklands, & after that it took some time for Galtieri etc. to assess the new government. Isn't it obvious that if the deciding factor had been our naval strength, the Falklands would have been invaded in between 1979 & 1981, when we only had one STOVL carrier & Sea Harrier wasn't operational, not in 1982, when we had two - both more capable than the one we had in 1979-80, & could fill both with fighters?
I've explained this so many times that I'm bloody sick of it. It's like telling people that the Japanese constitution doesn't forbid aircraft carriers. The lead-up to the Falklands war is one of the great internet myths, one of those false stories that millions believe because it's so widely spread.