But with respect, I rather think that the Bagnall reforms, taken on by Farndale, had rather more to do with worrying the Russians than Black Buck. the Soviets knew that the RAF was a capable - if underfunded and rather smaller than ideal - organisation, and while Black Buck might have taken them by surprise with the extent of its ambition and effects delivered (from all the sorties), it rather fitted in with their viewpoint.
BAOR, on the other hand, was given the job of dying bravely in a series of defensive actions which would, it appeared, precede the escalation to a nuclear exchange if the governments of the West were prepared to do this. Then, Bagnall changed the CONOPS and started talking about the counter-stroke, manoeuvrist approach, etc, etc, followed by Farndale, who syarted muttering about counter-attacks and the odd jest about marching on Moscow. The Sovs, via observers, spies and SOXMIS, came to the view that the bit up to marching on Moscow wasn't just bluster, and started to worry a bit more about the British sector than before. that's not to say that Black Buck didn't impress the Soviets, but if we're looking at a change in attitude towards the British sector, then Bagnall has to come in ahead of Black Buck as the overlooked but significant factor from the UK perspective.