fade to grey - the Vulcan raid has been discussed at length several times on Pprune. Somewhere - and I'm afraid I've not the time to find it at the moment - on one of the threads, I posted the observations of Admiral Woodward about Blackbuck, and the rationale behind the attacks as given by MRAF Beetham (CAS in 82).
Admiral Woodward, and Admirals Lewin, Fieldhouse and Leach were all keen on the possible psychological effect that such attacks might have on the Argentine junta and thought it well worth the fuel.
Before BLACKBUCK 1, CAS told the war cabinet that he would need at least 25 Vulcan sorties to shut the runway at Stanley, and would prefer to use 50 - nevertheless, it was thought that the attack was worth it, even if it was known that the chances of shutting the runway with one or two attacks were negligible.