Jimlad, when the deterrent was handed over to the RN only one thing changed. The V-force stood down from the QRA. We no longer mounted one aircraft per sqn at RS15.
In fact the perceived threat from the V-force increased significantly after 1968. Two sqns deployed to Akrotiri and forward dispersals in Iran and Pakistan increased the reach by thousands of miles. When we first deployed the peripheral SAM belt was quite thin east of the Black Sea. Post deployment there was a significant increase in SAM 2 and 3.
I spoke with a crew member from the Strike Wing and they had covered similar targets to the Bomber Wing but clearly the perceived threat was now greater.